feat: 新增 URL 标题抓取工具

- UtilsController 提供 /utils/fetch-title 接口，供前端获取网页标题
- TitleFetcher 工具类支持 HTTP/HTTPS 请求、重定向跟踪、gzip/deflate 解压
- 支持 SSL 宽松配置、编码自动检测、批量并行抓取
- 支持裸 URL 自动嵌入为 [标题](url) Markdown 格式

src/main/java/com/guo/learningprogresstracker/controller/UtilsController.java

@@ -0,0 +1,26 @@
+package com.guo.learningprogresstracker.controller;
+
+import com.guo.learningprogresstracker.entity.CommonResult;
+import com.guo.learningprogresstracker.utils.TitleFetcher;
+import io.swagger.v3.oas.annotations.Operation;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Map;
+
+@RestController
+@RequestMapping("/utils")
+public class UtilsController {
+
+    @GetMapping("/fetch-title")
+    @Operation(summary = "获取指定URL的页面标题")
+    public CommonResult<Map<String, String>> fetchTitle(@RequestParam String url) {
+        if (url == null || url.isBlank()) {
+            return CommonResult.error("url 参数不能为空");
+        }
+        String title = TitleFetcher.fetchTitle(url);
+        return CommonResult.success(Map.of("title", title != null ? title : url));
+    }
+}