refactor: 迁移到官方 MCP SDK (#167)

- 添加官方 SDK 依赖 github.com/modelcontextprotocol/go-sdk v0.7.0
- 新增 mcp_server.go 使用官方 SDK 注册 8 个 MCP 工具
- 删除自实现的 streamable_http.go（约 400 行）
- 更新 routes.go 使用 mcp.NewStreamableHTTPHandler
- 优化服务器优雅关闭逻辑（5秒超时 + 警告日志）
- 清理 types.go 中的 JSON-RPC 相关类型

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <noreply@anthropic.com>

go.sum

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@@ -47,6 +49,8 @@ github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWE
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@@ -79,16 +83,12 @@ github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS
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@@ -114,14 +114,12 @@ golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
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-golang.org/x/sys v0.35.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
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