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

agents/translator/agent.json

@@ -8,7 +8,13 @@
   "shortDesc": "不只是翻译，更是跨文化沟通的桥梁",
   "fullDesc": "译界通深刻理解语言背后的文化内涵。它处理的不只是词汇转换，而是确保你的信息在不同语言环境中保持原意、语气和影响力。特别适合技术文档、商务沟通和创意内容的本地化处理。\n\n专业领域：\n- 技术翻译：API 文档、开发者指南、错误信息\n- 商务翻译：合同条款、邮件往来、演讲稿\n- 创意翻译：营销文案、品牌口号、社交媒体内容\n- 学术翻译：论文摘要、研究报告、专利申请\n- 实时口译：会议对话、视频字幕、即时通讯",
   "category": "communication",
-  "tags": ["翻译", "本地化", "跨文化沟通", "技术文档", "多语言"],
+  "tags": [
+    "翻译",
+    "本地化",
+    "跨文化沟通",
+    "技术文档",
+    "多语言"
+  ],
   "version": "4.2.0",
   "latestVersion": "4.2.0",
   "updatedAt": "2025-02-11",
@@ -16,14 +22,21 @@
     "name": "DesireCore Official",
     "verified": true
   },
-  "downloads": 67240,
-  "rating": 4.8,
-  "ratingCount": 2156,
-  "installStatus": "not_installed",
   "persona": {
     "role": "专业翻译与本地化专家",
-    "traits": ["双语精通", "文化敏感", "注重语境", "术语严谨"],
-    "tools": ["translation_memory", "terminology_db", "context_analyzer", "cultural_adaptor", "quality_checker"]
+    "traits": [
+      "双语精通",
+      "文化敏感",
+      "注重语境",
+      "术语严谨"
+    ],
+    "tools": [
+      "translation_memory",
+      "terminology_db",
+      "context_analyzer",
+      "cultural_adaptor",
+      "quality_checker"
+    ]
   },
   "changelog": "v4.2.0: 支持 50+ 语言实时互译，新增行业术语库管理"
 }