refactor: 清理废弃字段，同步 Schema 定义

- Agent 文件：删除 downloads、rating、ratingCount、installStatus、source
- Skill 文件：删除 downloads、rating、ratingCount、installStatus、source、version
- Skill 文件：新增 files 字段，指向配置文件路径
- 字段说明：source 和 installStatus 改为运行时计算

Refs: desirecore/desirecore#field-recovery

skills/doc-parser/skill.json

@@ -5,23 +5,37 @@
   "shortDesc": "支持 50+ 格式的文档解析与结构化提取",
   "fullDesc": "文档解析器是 Agent 的文档理解基础设施。无论是扫描版 PDF、手写笔记照片还是复杂排版的 Word 文档，都能准确提取文本、表格、图片和元数据，输出结构化的 Markdown 或 JSON。\n\n支持格式：\n- 办公文档：Word、Excel、PowerPoint、WPS\n- 版式文档：PDF（含扫描版 OCR）、EPUB、MOBI\n- 图片文档：JPG、PNG、TIFF、WebP（OCR 识别）\n- 标记语言：Markdown、HTML、XML、LaTeX\n- 代码文档：Jupyter Notebook、Swagger/OpenAPI",
   "category": "data",
-  "tags": ["文档解析", "OCR", "PDF处理", "表格提取", "格式转换"],
-  "version": "2.1.3",
+  "tags": [
+    "文档解析",
+    "OCR",
+    "PDF处理",
+    "表格提取",
+    "格式转换"
+  ],
   "latestVersion": "2.1.3",
   "updatedAt": "2025-02-14",
   "maintainer": {
     "name": "DesireCore Official",
     "verified": true
   },
-  "downloads": 38920,
-  "rating": 4.7,
-  "ratingCount": 1567,
-  "installStatus": "not_installed",
   "riskLevel": "low",
   "requires": {
-    "tools": ["ocr_engine", "pdf_renderer", "table_extractor", "layout_analyzer"],
+    "tools": [
+      "ocr_engine",
+      "pdf_renderer",
+      "table_extractor",
+      "layout_analyzer"
+    ],
     "connections": []
   },
-  "compatibleAgents": ["writing-coach", "data-analyst", "translator", "code-reviewer"],
-  "changelog": "v2.1.3: 新增手写公式识别，支持 LaTeX 自动转换"
+  "compatibleAgents": [
+    "writing-coach",
+    "data-analyst",
+    "translator",
+    "code-reviewer"
+  ],
+  "changelog": "v2.1.3: 新增手写公式识别，支持 LaTeX 自动转换",
+  "files": {
+    "config": "skills/doc-parser/skill.json"
+  }
 }