fix: replace custom tools endpoints with MCP note, add checkBinary (EN+VI+ZH) (#53)

Custom tools REST endpoints are not implemented; replace with note directing
users to MCP servers and skills. Add new /v1/cli-credentials/checkBinary endpoint.

Author: thieung

reference/rest-api.md

@@ -496,17 +496,7 @@ Set `"dryRun": true` to return tool schema without execution.
 | `PUT` | `/v1/tools/builtin/{name}/tenant-config` | Set per-tenant override (admin) |
 | `DELETE` | `/v1/tools/builtin/{name}/tenant-config` | Remove per-tenant override (admin) |
 
-### Custom Tools
-
-| Method | Path | Description |
-|--------|------|-------------|
-| `GET` | `/v1/tools/custom` | List custom tools (paginated) |
-| `POST` | `/v1/tools/custom` | Create custom tool |
-| `GET` | `/v1/tools/custom/{id}` | Get tool details |
-| `PUT` | `/v1/tools/custom/{id}` | Update tool |
-| `DELETE` | `/v1/tools/custom/{id}` | Delete tool |
-
-Query parameters for list: `agent_id`, `search`, `limit`, `offset`
+> **Note:** Custom tools via REST API are not currently implemented. MCP servers and skills provide the recommended extension mechanism.
 
 ---
 
@@ -1044,6 +1034,7 @@ Requires **admin role** (full gateway token or empty gateway token in dev/single
 | `DELETE` | `/v1/cli-credentials/{id}` | Delete credential |
 | `GET` | `/v1/cli-credentials/presets` | Get preset credential templates |
 | `POST` | `/v1/cli-credentials/{id}/test` | Test credential connection (dry-run) |
+| `POST` | `/v1/cli-credentials/check-binary` | Validate a binary path for CLI credential use |
 
 ### Per-User CLI Credentials
 

vi/reference/rest-api.md

@@ -495,17 +495,7 @@ POST /v1/tools/invoke
 | `PUT` | `/v1/tools/builtin/{name}/tenant-config` | Đặt cấu hình ghi đè theo tenant (admin) |
 | `DELETE` | `/v1/tools/builtin/{name}/tenant-config` | Xóa cấu hình ghi đè theo tenant (admin) |
 
-### Custom Tools
-
-| Method | Path | Mô tả |
-|--------|------|-------|
-| `GET` | `/v1/tools/custom` | Liệt kê custom tool (có phân trang) |
-| `POST` | `/v1/tools/custom` | Tạo custom tool |
-| `GET` | `/v1/tools/custom/{id}` | Lấy chi tiết tool |
-| `PUT` | `/v1/tools/custom/{id}` | Cập nhật tool |
-| `DELETE` | `/v1/tools/custom/{id}` | Xóa tool |
-
-Query param cho list: `agent_id`, `search`, `limit`, `offset`
+> **Lưu ý:** Custom tools qua REST API hiện chưa được triển khai. MCP servers và skills là cơ chế mở rộng được khuyến nghị.
 
 ---
 
@@ -992,6 +982,7 @@ Yêu cầu **admin role** (full gateway token hoặc gateway token rỗng ở ch
 | `DELETE` | `/v1/cli-credentials/{id}` | Xóa credential |
 | `GET` | `/v1/cli-credentials/presets` | Lấy preset credential template |
 | `POST` | `/v1/cli-credentials/{id}/test` | Test kết nối credential (dry-run) |
+| `POST` | `/v1/cli-credentials/check-binary` | Xác thực đường dẫn binary cho CLI credential |
 
 ### Per-User CLI Credentials
 

zh/reference/rest-api.md

@@ -463,17 +463,7 @@ POST /v1/tools/invoke
 | `PUT` | `/v1/tools/builtin/{name}/tenant-config` | 设置租户级覆盖（管理员）|
 | `DELETE` | `/v1/tools/builtin/{name}/tenant-config` | 移除租户级覆盖（管理员）|
 
-### 自定义工具
-
-| 方法 | 路径 | 说明 |
-|--------|------|-------------|
-| `GET` | `/v1/tools/custom` | 列出自定义工具（分页）|
-| `POST` | `/v1/tools/custom` | 创建自定义工具 |
-| `GET` | `/v1/tools/custom/{id}` | 获取工具详情 |
-| `PUT` | `/v1/tools/custom/{id}` | 更新工具 |
-| `DELETE` | `/v1/tools/custom/{id}` | 删除工具 |
-
-列表查询参数：`agent_id`、`search`、`limit`、`offset`
+> **注意：** REST API 的自定义工具端点当前未实现。推荐使用 MCP servers 和 skills 作为扩展机制。
 
 ---
 
@@ -960,6 +950,7 @@ agents/{agent_key}/workspace/          — 每个 agent 的工作区文件
 | `DELETE` | `/v1/cli-credentials/{id}` | 删除凭证 |
 | `GET` | `/v1/cli-credentials/presets` | 获取预设凭证模板 |
 | `POST` | `/v1/cli-credentials/{id}/test` | 测试凭证连接（演习）|
+| `POST` | `/v1/cli-credentials/check-binary` | 验证 CLI 凭证的二进制路径 |
 
 ### 按用户 CLI 凭证