feat: 完善范式润色功能和相关组件

- 新增范式选择模态框 (ParadigmSelectorModal)
- 新增差异标注面板 (DiffAnnotationPanel)
- 新增精确差异处理工具 (preciseDiff.js)
- 更新各面板组件支持范式润色功能
- 更新范式配置文件 (paradigms.js)
- 更新依赖配置

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -13,6 +13,9 @@
     "@tiptap/starter-kit": "^3.15.3",
     "@tiptap/vue-3": "^3.15.3",
     "axios": "^1.6.0",
+    "diff-match-patch": "^1.0.5",
+    "docx": "^9.5.1",
+    "file-saver": "^2.0.5",
     "marked": "^9.1.0",
     "pinia": "^2.1.0",
     "sql.js": "^1.13.0",