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/library/Get User Visible Libraries.yml

@@ -0,0 +1,38 @@
+info:
+  name: Get User Visible Libraries
+  type: http
+  seq: 1
+http:
+  method: GET
+  url: '{{base_url}}/api/libraries/visible'
+  auth: inherit
+  body:
+    type: none
+  headers:
+  - key: Content-Type
+    value: application/json
+
+docs: |-
+  ## Get User Visible Libraries
+    
+    Retrieves all libraries that are visible to regular users.
+    
+    **Method:** GET
+    
+    **Endpoint:** /api/libraries/visible
+    
+    **Authentication:** Required (Bearer token)
+    
+    **Response:** Array of visible library objects
+    - `id` (string): Library UUID
+    - `name` (string): Library name
+    - `description` (string, optional): Library description
+    - `type` (string): Library type (ebooks, audiobooks, videos, other)
+    - `is_visible` (boolean): Always true for this endpoint
+    - `media_count` (number): Number of media items in library
+    - `created_at` (string): Creation timestamp
+    
+    **Status Codes:**
+    - 200: Success
+    - 401: Unauthorized
+    - 500: Internal server error