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/universal-progress/Get Universal Progress.bru

@@ -1,14 +1,55 @@
 meta {
-  name: "Get Universal Progress"
-  type: "http"
+  name: Get Universal Progress
+  type: http
   seq: 1
 }
 
 get {
-  url: "{{baseUrl}}/api/progress/{{mediaItemId}}"
-  body: null
-  headers: {
-    Authorization: "Bearer {{jwt}}"
-    Content-Type: "application/json"
-  }
+  url: {{baseUrl}}/api/progress/{{mediaItemId}}
+  body: none
+  auth: inherit
+}
+
+headers {
+  Authorization: Bearer {{jwt}}
+  Content-Type: application/json
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}
+
+docs {
+  ## Get Universal Progress
+
+  Retrieves universal reading progress for a specific media item across all devices.
+
+  **Method:** GET
+
+  **Endpoint:** /api/progress/{mediaItemId}
+
+  **Authentication:** Bearer token
+
+  **Path Parameters:**
+  - `mediaItemId` (string): Media item UUID
+
+  **Response:**
+  - `media_item_id` (string): Media item UUID
+  - `progress` (object): Universal progress data
+    - `percentage` (number): Overall progress percentage
+    - `epubcfi` (string): EPUB location
+    - `page` (number): Current page
+    - `chapter` (number): Current chapter
+  - `devices` (array): Per-device progress data
+    - `device_id` (string): Device UUID
+    - `device_name` (string): Device name
+    - `progress` (object): Device-specific progress
+  - `last_updated` (string): Last update timestamp
+
+  **Status Codes:**
+  - 200: Success
+  - 401: Unauthorized
+  - 404: Media item not found
+  - 500: Internal server error
 }