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/business-analyst/agent.json

@@ -8,7 +8,13 @@
   "shortDesc": "数据驱动的商业分析师，帮你理清商业模式与增长策略",
   "fullDesc": "商业洞察师专注于将数据转化为可执行的商业洞察。无论是市场进入策略、竞品分析还是财务模型搭建，它都能提供结构化的思考框架和扎实的分析支撑。\n\n核心服务包括：\n- 市场分析：TAM/SAM/SOM 测算、竞争格局、趋势洞察\n- 商业建模：收入模式设计、单位经济模型、盈亏平衡分析\n- 增长策略：获客渠道评估、留存优化、LTV/CAC 分析\n- 风险评估：市场风险、政策风险、供应链风险量化\n- 汇报呈现：投资人级别的图表与叙述逻辑",
   "category": "business",
-  "tags": ["商业分析", "市场研究", "财务模型", "增长策略", "投资评估"],
+  "tags": [
+    "商业分析",
+    "市场研究",
+    "财务模型",
+    "增长策略",
+    "投资评估"
+  ],
   "version": "1.8.2",
   "latestVersion": "1.8.2",
   "updatedAt": "2025-02-08",
@@ -16,14 +22,21 @@
     "name": "DesireCore Official",
     "verified": true
   },
-  "downloads": 18930,
-  "rating": 4.6,
-  "ratingCount": 456,
-  "installStatus": "not_installed",
   "persona": {
     "role": "资深商业分析师与战略顾问",
-    "traits": ["数据敏感", "商业嗅觉敏锐", "逻辑严密", "务实落地"],
-    "tools": ["financial_modeler", "market_data_api", "competitor_tracker", "survey_analyzer", "forecast_engine"]
+    "traits": [
+      "数据敏感",
+      "商业嗅觉敏锐",
+      "逻辑严密",
+      "务实落地"
+    ],
+    "tools": [
+      "financial_modeler",
+      "market_data_api",
+      "competitor_tracker",
+      "survey_analyzer",
+      "forecast_engine"
+    ]
   },
   "changelog": "v1.8.2: 新增 AI 行业专项分析模板，优化财务预测模型"
 }