docs(scanner): update Bruno requests for new scanner endpoints

- Update Scan Ebooks.bru to reflect async background scanning
- Add Get Scan Status.bru for checking job progress
- Add Start Watch Mode.bru for instant file monitoring
- Add Stop Watch Mode.bru for stopping library monitoring
- Add Get Watch Mode Status.bru for checking watched libraries
- Document all new endpoints with examples and status codes

bruno/scanner/Get Watch Mode Status.bru

@@ -0,0 +1,47 @@
+meta {
+  name: Get Watch Mode Status
+  type: http
+  seq: 7
+}
+
+get {
+  url: {{base_url}}/api/scanner/watch/status
+  auth: inherit
+}
+
+docs {
+  ## Get Watch Mode Status
+  
+  Retrieves the current status of watch mode for all libraries.
+  
+  **Method:** GET
+  
+  **Endpoint:** /api/scanner/watch/status
+  
+  **Authentication:** Required (Bearer token, Admin only)
+  
+  **Response:** HTTP 200 (OK)
+  ```json
+  {
+    "watching_libraries": [
+      "550e8400-e29b-41d4-a716-446655440000",
+      "660e8400-e29b-41d4-a716-446655440001"
+    ],
+    "total_watching": 2
+  }
+  ```
+  
+  **Properties:**
+  - `watching_libraries` (array of strings): List of library IDs currently being watched
+  - `total_watching` (number): Total number of libraries being watched
+  
+  **Status Codes:**
+  - 200: Status retrieved successfully
+  - 401: Unauthorized
+  - 403: Forbidden (admin access required)
+  
+  **Use cases:**
+  - Check which libraries are currently being monitored
+  - Verify that watch mode started successfully after server boot
+  - Debug file system monitoring issues
+}