完善分层 AGENTS.md，便于快速定位代码

go-gost/x/api/AGENTS.md

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+# GO-GOST/X API KNOWLEDGE BASE
+
+## OVERVIEW
+Gin-based management API for reading/writing config and controlling services at runtime.
+
+## WHERE TO LOOK
+| Task | Location | Notes |
+|------|----------|-------|
+| Route registration | `go-gost/x/api/api.go` | `Register(*gin.Engine, *Options)` |
+| Auth gating | `go-gost/x/api/middleware.go` | Drops non-BasicAuth requests; optional auther check |
+| Service CRUD + pause/resume | `go-gost/x/api/config_service.go` | Uses registry + `config.OnUpdate(...)` |
+| Swagger spec | `go-gost/x/api/swagger.yaml` | Served at `/docs` via embedded FS |
+
+## CONVENTIONS
+- CORS is `AllowAllOrigins: true` (see `go-gost/x/api/api.go`).
+- Requests without a valid Basic `Authorization` header are silently dropped (connection hijack + close) by `GlobalInterceptor()`.
+- Many operations mutate the in-memory config via `config.OnUpdate(...)` after starting/stopping services.
+
+## COMMANDS
+```bash
+cd go-gost/x
+go test ./...
+```