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/Scan Ebooks.bru

@@ -1,5 +1,5 @@
 meta {
-  name: Scan Ebooks
+  name: Scan Ebooks (Background)
   type: http
   seq: 1
 }
@@ -15,37 +15,48 @@ settings {
   timeout: 0
 }
 
+body:json {
+  {
+    "folder_paths": ["/path/to/ebooks"]
+  }
+}
+
 docs {
-  ## Scan Ebooks
+  ## Scan Ebooks (Background)
   
-  Triggers a scanning operation to discover and index ebook files in the library.
+  Triggers an asynchronous ebook scanning operation. The scan runs in the background and can be monitored using the job ID.
   
   **Method:** POST
   
   **Endpoint:** /api/scanner/scan
   
-  **Authentication:** Required (Bearer token)
+  **Authentication:** Required (Bearer token, Admin only)
   
-  **Request Body:** (optional)
-  - `library_id` (string, optional): Specific library ID to scan
-  - `scan_depth` (number, optional): Maximum directory depth to scan
-  - `file_types` (array, optional): File extensions to include
+  **Request Body:**
+  - `folder_paths` (array of strings, required): List of folder paths to scan
+    - Example: `["/path/to/ebooks", "/another/path"]`
   
-  **Response:**
-  - JSON object containing scan operation details
-    - `scan_id` (string): Unique scan operation identifier
-    - `status` (string): Scan status ("initiated", "running", "completed")
-    - `library_id` (string): Library being scanned
-    - `files_found` (number): Number of files discovered
-    - `files_processed` (number): Number of files processed
-    - `started_at` (string): Scan start timestamp
-    - `estimated_completion` (string): Estimated completion time
+  **Response:** HTTP 202 (Accepted)
+  ```json
+  {
+    "message": "scan job enqueued",
+    "job_id": "550e8400-e29b-41d4-a716-446655440000",
+    "status": "pending"
+  }
+  ```
+  
+  **Properties:**
+  - `message` (string): Confirmation message
+  - `job_id` (string): Unique job identifier for tracking progress
+  - `status` (string): Initial job status ("pending")
   
   **Status Codes:**
-  - 200: Scan initiated successfully
-  - 400: Invalid request parameters
+  - 202: Scan job successfully enqueued
+  - 400: Invalid request (missing folder_paths)
   - 401: Unauthorized
-  - 403: Forbidden (insufficient permissions)
-  - 409: Scan already in progress
-  - 500: Internal server error
+  - 403: Forbidden (admin access required)
+  - 500: Failed to enqueue scan job
+  
+  **Next Steps:**
+  Use the returned `job_id` with `GET /api/scanner/status/:jobId` to check scan progress.
 }