release: v1.4.0 — 标签系统、操作日志扩展与文档截图更新

- 每用户标签与彩色打标，图库 OR/AND 筛选与批量打标
- 操作日志记录登录、删除、设置与标签操作
- API 标签/打标接口；README 与文档站截图同步

docs-site/en/guide/api.md

@@ -2,6 +2,8 @@
 
 PicHost exposes REST endpoints and a Twikoo-compatible upload. After sign-in, open **API** in the nav: a sidebar lists endpoints and token controls, the center shows parameters and copyable cURL, and the right panel supports **live debugging**.
 
+![API docs and debugger](/screenshots/api.png)
+
 ## Authentication
 
 All REST calls use:
@@ -28,9 +30,12 @@ Upload one or more images via `image`; also accepts `file`, `files`. Stored unde
 ```bash
 curl -X POST "https://admin.example.com/api/images/upload" \
   -H "Auth-Token: YOUR_TOKEN" \
-  -F "image=@./demo.png"
+  -F "image=@./demo.png" \
+  -F 'tagIds=[1,2]'
 ```
 
+Optional form field `tagIds`: JSON array string or repeated fields. Tags do **not** change storage paths under `images/`.
+
 ### 2. List images
 
 `GET /api/images`
@@ -42,6 +47,8 @@ curl "https://admin.example.com/api/images?limit=20&page=1" \
   -H "Auth-Token: YOUR_TOKEN"
 ```
 
+Optional query: `tagIds` (comma-separated, OR by default), `tagMode=and`, `untagged=1`. Each item includes a `tags` array.
+
 ### 3. Search images
 
 `GET /api/images/search`
@@ -77,6 +84,27 @@ curl -X POST "https://admin.example.com/api/images/batch-delete" \
   -d '{"keys":["images/2026/08/a.webp","images/2026/08/b.webp"]}'
 ```
 
+### 6. Tags
+
+| Method | Path | Description |
+| ------ | ---- | ----------- |
+| `GET` | `/api/tags` | List current user’s tags |
+| `POST` | `/api/tags` | Create `{ "name": "work", "color": "#22c55e" }` |
+| `PATCH` | `/api/tags/:id` | Rename or recolor |
+| `DELETE` | `/api/tags/:id` | Delete tag (images remain) |
+| `POST` | `/api/tags/merge` | Merge tags into a target |
+
+### 7. Image tags
+
+| Method | Path | Description |
+| ------ | ---- | ----------- |
+| `POST` | `/api/images/tags` | Add tags to an image |
+| `PATCH` | `/api/images/tags` | Replace tag set |
+| `DELETE` | `/api/images/tags` | Remove one tag |
+| `POST` | `/api/images/batch-tags` | Batch add/remove |
+
+`GET /api/stats` accepts the same tag filter query params as the list API.
+
 ## Errors
 
 REST responses are JSON with `code` and `message` (`UNAUTHORIZED`, `FORBIDDEN`, `INVALID_REQUEST`, etc.). Twikoo uses EasyImage-compatible JSON.