diff --git a/src/main/java/com/guo/learningprogresstracker/service/impl/MindMapFileParser.java b/src/main/java/com/guo/learningprogresstracker/service/impl/MindMapFileParser.java
deleted file mode 100644
index 01eb4e1..0000000
--- a/src/main/java/com/guo/learningprogresstracker/service/impl/MindMapFileParser.java
+++ /dev/null
@@ -1,314 +0,0 @@
-package com.guo.learningprogresstracker.service.impl;
-
-import com.fasterxml.jackson.databind.JsonNode;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.guo.learningprogresstracker.enums.ReviewMindMapFileFormatEnum;
-import org.springframework.web.multipart.MultipartFile;
-import org.w3c.dom.Document;
-import org.w3c.dom.Element;
-import org.w3c.dom.NodeList;
-
-import javax.xml.parsers.DocumentBuilderFactory;
-import java.io.ByteArrayInputStream;
-import java.io.IOException;
-import java.nio.charset.StandardCharsets;
-import java.util.ArrayDeque;
-import java.util.ArrayList;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.zip.ZipEntry;
-import java.util.zip.ZipInputStream;
-
-class MindMapFileParser {
-
-    private final ObjectMapper objectMapper;
-
-    MindMapFileParser(ObjectMapper objectMapper) {
-        this.objectMapper = objectMapper;
-    }
-
-    ParseResult parse(MultipartFile file, ReviewMindMapFileFormatEnum format) throws IOException {
-        byte[] bytes = file.getBytes();
-        Map<String, Object> root = switch (format) {
-            case XMIND -> parseXMind(bytes);
-            case MARKDOWN -> parseMarkdown(new String(bytes, StandardCharsets.UTF_8), format);
-            case OPML -> parseOutlineXml(bytes, "text", format);
-            case FREEMIND -> parseOutlineXml(bytes, "TEXT", format);
-            case TEXT -> parseMarkdown(new String(bytes, StandardCharsets.UTF_8), format);
-        };
-        String title = String.valueOf(root.getOrDefault("title", file.getOriginalFilename()));
-        String outline = toOutline(root);
-        int nodeCount = countNodes(root);
-        int depth = maxDepth(root);
-        String summary = "共解析 " + nodeCount + " 个节点，最大层级 " + depth + "。";
-        return new ParseResult(title, format.getCode(), objectMapper.writeValueAsString(root), outline, summary);
-    }
-
-    private Map<String, Object> parseXMind(byte[] bytes) throws IOException {
-        byte[] contentJson = null;
-        byte[] contentXml = null;
-        try (ZipInputStream zipInputStream = new ZipInputStream(new ByteArrayInputStream(bytes))) {
-            ZipEntry entry;
-            while ((entry = zipInputStream.getNextEntry()) != null) {
-                if ("content.json".equals(entry.getName())) {
-                    contentJson = zipInputStream.readAllBytes();
-                } else if ("content.xml".equals(entry.getName())) {
-                    contentXml = zipInputStream.readAllBytes();
-                }
-            }
-        }
-        if (contentJson != null) {
-            return parseXMindJson(contentJson);
-        }
-        if (contentXml != null) {
-            return parseXMindXml(contentXml);
-        }
-        throw new IOException("未找到 XMind 内容文件");
-    }
-
-    private Map<String, Object> parseXMindJson(byte[] bytes) throws IOException {
-        JsonNode sheets = objectMapper.readTree(bytes);
-        JsonNode sheet = sheets.isArray() && !sheets.isEmpty() ? sheets.get(0) : sheets;
-        JsonNode rootTopic = sheet.path("rootTopic");
-        Map<String, Object> root = node(rootTopic.path("title").asText("XMind 导图"));
-        root.put("sourceFormat", ReviewMindMapFileFormatEnum.XMIND.getCode());
-        root.put("nodes", parseXMindTopicChildren(rootTopic));
-        return root;
-    }
-
-    private List<Map<String, Object>> parseXMindTopicChildren(JsonNode topic) {
-        List<Map<String, Object>> result = new ArrayList<>();
-        JsonNode attached = topic.path("children").path("attached");
-        if (!attached.isArray()) {
-            return result;
-        }
-        for (JsonNode child : attached) {
-            Map<String, Object> item = node(child.path("title").asText("未命名节点"));
-            item.put("children", parseXMindTopicChildren(child));
-            result.add(item);
-        }
-        return result;
-    }
-
-    private Map<String, Object> parseXMindXml(byte[] bytes) throws IOException {
-        Document document = xmlDocument(bytes);
-        Element sheet = firstElementByName(document.getDocumentElement(), "sheet");
-        Element topic = sheet == null ? firstElementByName(document.getDocumentElement(), "topic") : firstElementByName(sheet, "topic");
-        if (topic == null) {
-            throw new IOException("未找到 XMind 根节点");
-        }
-        Map<String, Object> root = parseTopicElement(topic);
-        root.put("sourceFormat", ReviewMindMapFileFormatEnum.XMIND.getCode());
-        root.put("nodes", root.remove("children"));
-        return root;
-    }
-
-    private Map<String, Object> parseMarkdown(String content, ReviewMindMapFileFormatEnum format) {
-        Map<String, Object> root = node("导图大纲");
-        root.put("sourceFormat", format.getCode());
-        List<Map<String, Object>> roots = new ArrayList<>();
-        root.put("nodes", roots);
-
-        ArrayDeque<StackItem> stack = new ArrayDeque<>();
-        stack.push(new StackItem(0, roots));
-        for (String rawLine : content.split("\\R")) {
-            String line = rawLine.stripTrailing();
-            if (line.isBlank()) {
-                continue;
-            }
-            int level = markdownLevel(line);
-            String title = markdownTitle(line);
-            Map<String, Object> item = node(title);
-            while (stack.peek().level >= level) {
-                stack.pop();
-            }
-            stack.peek().children.add(item);
-            @SuppressWarnings("unchecked")
-            List<Map<String, Object>> children = (List<Map<String, Object>>) item.get("children");
-            stack.push(new StackItem(level, children));
-        }
-        if (!roots.isEmpty()) {
-            root.put("title", roots.get(0).get("title"));
-        }
-        return root;
-    }
-
-    private Map<String, Object> parseOutlineXml(byte[] bytes, String titleAttribute, ReviewMindMapFileFormatEnum format) throws IOException {
-        Document document = xmlDocument(bytes);
-        Element rootElement = document.getDocumentElement();
-        Element first = firstElementByName(rootElement, "outline");
-        if (first == null) {
-            first = firstElementByName(rootElement, "node");
-            titleAttribute = "TEXT";
-        }
-        if (first == null) {
-            throw new IOException("未找到导图节点");
-        }
-        Map<String, Object> root = parseOutlineElement(first, titleAttribute);
-        root.put("sourceFormat", format.getCode());
-        root.put("nodes", root.remove("children"));
-        return root;
-    }
-
-    private Document xmlDocument(byte[] bytes) throws IOException {
-        try {
-            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
-            factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
-            factory.setFeature("http://xml.org/sax/features/external-general-entities", false);
-            factory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
-            factory.setNamespaceAware(false);
-            return factory.newDocumentBuilder().parse(new ByteArrayInputStream(bytes));
-        } catch (Exception e) {
-            throw new IOException("导图 XML 解析失败", e);
-        }
-    }
-
-    private Map<String, Object> parseTopicElement(Element element) {
-        Map<String, Object> item = node(textOfFirstChild(element, "title", "未命名节点"));
-        item.put("children", childTopicElements(element).stream()
-                .map(this::parseTopicElement)
-                .toList());
-        return item;
-    }
-
-    private Map<String, Object> parseOutlineElement(Element element, String titleAttribute) {
-        String title = element.getAttribute(titleAttribute);
-        if (title == null || title.isBlank()) {
-            title = element.getAttribute("text");
-        }
-        if (title == null || title.isBlank()) {
-            title = "未命名节点";
-        }
-        Map<String, Object> item = node(title);
-        List<Map<String, Object>> children = directChildElements(element).stream()
-                .filter(child -> "outline".equalsIgnoreCase(child.getTagName()) || "node".equalsIgnoreCase(child.getTagName()))
-                .map(child -> parseOutlineElement(child, titleAttribute))
-                .toList();
-        item.put("children", children);
-        return item;
-    }
-
-    private Map<String, Object> node(String title) {
-        Map<String, Object> node = new LinkedHashMap<>();
-        node.put("title", title);
-        node.put("notes", "");
-        node.put("children", new ArrayList<Map<String, Object>>());
-        return node;
-    }
-
-    private int markdownLevel(String line) {
-        String trimmed = line.stripLeading();
-        if (trimmed.startsWith("#")) {
-            int count = 0;
-            while (count < trimmed.length() && trimmed.charAt(count) == '#') {
-                count++;
-            }
-            return count;
-        }
-        int indent = line.length() - trimmed.length();
-        return 1 + indent / 2;
-    }
-
-    private String markdownTitle(String line) {
-        return line.strip()
-                .replaceFirst("^#{1,6}\\s*", "")
-                .replaceFirst("^[-*+]\\s*", "")
-                .replaceFirst("^\\d+\\.\\s*", "");
-    }
-
-    private List<Element> childTopicElements(Element element) {
-        return directChildElements(element).stream()
-                .flatMap(child -> {
-                    if ("topic".equalsIgnoreCase(child.getTagName())) {
-                        return List.of(child).stream();
-                    }
-                    return childTopicElements(child).stream();
-                })
-                .toList();
-    }
-
-    private Element firstElementByName(Element element, String name) {
-        if (name.equalsIgnoreCase(element.getTagName())) {
-            return element;
-        }
-        NodeList nodes = element.getChildNodes();
-        for (int i = 0; i < nodes.getLength(); i++) {
-            if (nodes.item(i) instanceof Element child) {
-                Element found = firstElementByName(child, name);
-                if (found != null) {
-                    return found;
-                }
-            }
-        }
-        return null;
-    }
-
-    private List<Element> directChildElements(Element element) {
-        List<Element> result = new ArrayList<>();
-        NodeList nodes = element.getChildNodes();
-        for (int i = 0; i < nodes.getLength(); i++) {
-            if (nodes.item(i) instanceof Element child) {
-                result.add(child);
-            }
-        }
-        return result;
-    }
-
-    private String textOfFirstChild(Element element, String name, String fallback) {
-        for (Element child : directChildElements(element)) {
-            if (name.equalsIgnoreCase(child.getTagName())) {
-                return child.getTextContent();
-            }
-        }
-        return fallback;
-    }
-
-    private String toOutline(Map<String, Object> root) {
-        StringBuilder builder = new StringBuilder();
-        appendOutline(builder, root, 0);
-        return builder.toString();
-    }
-
-    @SuppressWarnings("unchecked")
-    private void appendOutline(StringBuilder builder, Map<String, Object> node, int level) {
-        builder.append("  ".repeat(level)).append("- ").append(node.get("title")).append('\n');
-        Object children = node.get(level == 0 && node.containsKey("nodes") ? "nodes" : "children");
-        if (children instanceof List<?> list) {
-            for (Object child : list) {
-                appendOutline(builder, (Map<String, Object>) child, level + 1);
-            }
-        }
-    }
-
-    @SuppressWarnings("unchecked")
-    private int countNodes(Map<String, Object> node) {
-        int count = 1;
-        Object children = node.get(node.containsKey("nodes") ? "nodes" : "children");
-        if (children instanceof List<?> list) {
-            for (Object child : list) {
-                count += countNodes((Map<String, Object>) child);
-            }
-        }
-        return count;
-    }
-
-    @SuppressWarnings("unchecked")
-    private int maxDepth(Map<String, Object> node) {
-        Object children = node.get(node.containsKey("nodes") ? "nodes" : "children");
-        if (!(children instanceof List<?> list) || list.isEmpty()) {
-            return 1;
-        }
-        int max = 1;
-        for (Object child : list) {
-            max = Math.max(max, 1 + maxDepth((Map<String, Object>) child));
-        }
-        return max;
-    }
-
-    record ParseResult(String title, String fileFormat, String parsedContent, String outline, String summary) {
-    }
-
-    private record StackItem(int level, List<Map<String, Object>> children) {
-    }
-}