feat(plugin): 插件热安装(MCP server) — POST /admin/plugins/install 连接+发现+注册工具进registry+落盘plugins.json

- capability/plugin/manager.go: Manager(Install/Uninstall/List/Restore/Close); Install=连接+发现+mcp:name注册工具,失败不落盘; holder持有*mcp.Registry; boot Restore重装
- config/runtimeconfig/plugins.go: PluginConfig(Normalize/Validate), LoadPlugins/SavePlugins(0600+tmp+rename)/Upsert/Delete/Masked(apiKey+敏感env掩码)
- mcp: MCPConfig加APIKey/Env, http/sse Bearer应用, stdio子进程env合并; registry.ToolNames()
- gateway: adminPluginInstall/Uninstall/ListInstalledPlugins; Deps.Plugins注入
- cmd/cyrene/plugins.go: wirePlugins(boot Restore+close)
- 契约: body{kind:mcp,name,config{transport, endpoint?/command?,args?,apiKey?,env?}} → {installed,name,kind,transport,toolCount}; 失败502不落盘/非法400/未注入501; 卸载连带unregister+删配置
- 测试(manager/plugins/admin/mcp_auth/组合根), build/vet/test绿+3平台交叉编译
- Docs/api-client v0.28 + api-reference install=501改真实; .gitignore加plugins.json
- 前端api.ts仍发旧body(无config)会400, 面板安装表单待后续

internal/capability/mcp/registry.go

@@ -127,6 +127,14 @@ func (r *Registry) refresh() {
 	r.log.Info("mcp tools refreshed", "name", r.mcp.cfg.Name, "count", len(r.names))
 }
 
+// ToolNames returns a copy of the tool names this registry registered, in
+// registration order. It is empty before Register succeeds.
+func (r *Registry) ToolNames() []string {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	return append([]string(nil), r.names...)
+}
+
 // Unregister removes every tool this registry previously registered and closes
 // the underlying client. It is safe to call multiple times.
 func (r *Registry) Unregister(ctx context.Context) error {