refactor(bruno): migrate API tests to Bruno DSL format

- Convert all existing .bru files from JSON to Bruno DSL format
- Remove obsolete files (conflicts/api.bru, kobo/Kobo Initialization.bru)
- Update auth configuration to use 'inherit' instead of explicit bearer tokens
- Add comprehensive documentation to all test files
- Improve test scripts with proper assertions and error handling

bruno/queue/Get Device Queue Stats.bru

@@ -7,35 +7,31 @@ meta {
 get {
   url: {{base_url}}/api/queue/devices/{{device_id}}/stats
   body: none
-  auth: bearer
-}
-
-headers: {
-  Authorization: Bearer {{token}}
+  auth: inherit
 }
 
 docs {
   ## Get Device Queue Stats
-  
+
   Retrieves statistics for a specific device's sync queue.
-  
+
   **Method:** GET
-  
+
   **Endpoint:** /api/queue/devices/:device_id/stats
-  
+
   **Authentication:** Bearer token
-  
+
   **Path Parameters:**
    - `device_id` (string): Device UUID
-  
+
   **Response:**
    - Queue statistics including pending, completed, and failed counts
-  
+
   **Status Codes:**
    - 200: Success
    - 401: Unauthorized
    - 404: Device not found
-  
+
   **Example Response:**
    ```json
    {