chore: 接入 ESLint 并修复存量错误

eslint.config.js

@@ -0,0 +1,32 @@
+import js from '@eslint/js'
+import pluginVue from 'eslint-plugin-vue'
+import tseslint from 'typescript-eslint'
+
+export default [
+  {
+    ignores: [
+      'dist/**',
+      'node_modules/**',
+      'test-results/**',
+      'playwright-report/**',
+      'env.d.ts',
+    ],
+  },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  ...pluginVue.configs['flat/essential'],
+  {
+    files: ['**/*.vue'],
+    languageOptions: {
+      parserOptions: { parser: tseslint.parser },
+    },
+  },
+  {
+    rules: {
+      // 页面级组件与路由表同名（Study/Review/Login…），命名约定见 AGENTS.md
+      'vue/multi-word-component-names': 'off',
+      // 渐进收敛：存量代码仍有 any，新代码约束见 AGENTS.md
+      '@typescript-eslint/no-explicit-any': 'warn',
+    },
+  },
+]