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/admin/Get Admin Library.yml

@@ -0,0 +1,30 @@
+info:
+  name: Get Admin Library
+  type: http
+  seq: 5
+http:
+  method: GET
+  url: '{{base_url}}/admin/library'
+  auth: inherit
+  body:
+    type: none
+
+docs: |-
+  ## Get Admin Library Page
+    
+    Retrieves the admin library page for administrative access.
+    
+    **Method:** GET
+    
+    **Endpoint:** /admin/library
+    
+    **Headers:**
+    - `Authorization` (string): Bearer token
+    
+    **Response:**
+    - HTML content for the admin library page
+    
+    **Status Codes:**
+    - 200: Success
+    - 401: Unauthorized
+    - 403: Forbidden