refactor(bruno): reorganize file structure from bruno-yaml to flat bruno directory

- Move all files from bruno-yaml/* to bruno/*
- Maintains existing directory structure within categories
- Updates bruno/user/auth files with OAuth2 refresh token flow
- Updates bruno/user/profile files for user profile management
- Adds bruno/dashboard/ directory with dashboard API tests
- Preserves all existing test scenarios and OpenCollection YAML format
- No functional changes - file reorganization only

bruno/media-items/scenarios/List Media Items.yml

@@ -0,0 +1,49 @@
+info:
+  name: List Media Items
+  type: http
+  seq: 1
+http:
+  method: GET
+  url: '{{base_url}}/api/media-items?library_id={{library_id}}&limit=20&offset=0'
+  auth: inherit
+  headers:
+  - key: Content-Type
+    value: application/json
+runtime:
+  scripts:
+  - type: tests
+    code: "test_list_media_items_success(status, headers, body) {\n    if (status\
+      \ !== 200) {\n      throw new Error(\"Expected status 200, got \" + status);"
+
+docs: |-
+  ## List Media Items
+    
+    Retrieves a paginated list of media items from a specific library.
+    
+    **Method:** GET
+    
+    **Endpoint:** /api/media-items
+    
+    **Authentication:** Required (Bearer token)
+    
+    **Query Parameters:**
+    - `library_id` (string, required): Library UUID to filter items
+    - `limit` (number, optional): Number of results per page (default: 20, max: 100)
+    - `offset` (number, optional): Pagination offset (default: 0)
+    
+    **Response:** Array of media item objects
+    - `id` (string): Media item UUID
+    - `title` (string): Media item title
+    - `library_id` (string): Library UUID
+    - `media_type` (string): Type of media (e.g., "ebook", "audiobook")
+    - `file_path` (string): Path to media file
+    - `created_at` (string): Creation timestamp
+    - `updated_at` (string): Last update timestamp
+    
+    **Status Codes:**
+    - 200: Success
+    - 400: Invalid query parameters
+    - 401: Unauthorized
+    - 403: Forbidden (library access denied)
+    - 404: Library not found
+    - 500: Internal server error