chore: 接入 Tushare skill 与 MCP Server

- .agents/skills/tushare + .claude/skills 符号链接：自然语言查A股/财报/资金流/板块等数据
- .mcp.json：tushareMcp（HTTP 型，token 鉴权），重启 Claude Code 后生效
- skills-lock.json：skill 版本锁定

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

skills-lock.json

@@ -0,0 +1,11 @@
+{
+  "version": 1,
+  "skills": {
+    "tushare": {
+      "source": "waditu-tushare/skills",
+      "sourceType": "github",
+      "skillPath": "tushare/SKILL.md",
+      "computedHash": "6e8c82c438a9494bb932c695769ce9ff1dede5d69cd90753f0f182b0dc0f3a7a"
+    }
+  }
+}