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 Library Folders.yml

@@ -0,0 +1,22 @@
+info:
+  name: Get Library Folders
+  type: http
+  seq: 1
+http:
+  method: GET
+  url: '{{base_url}}/api/libraries/{{library_id}}/folders'
+  auth: inherit
+  body:
+    type: none
+  headers:
+  - key: Content-Type
+    value: application/json
+
+docs: |-
+  ## Get Library Folders
+    
+    Retrieves all folders associated with a specific library.
+    
+    **Method:** GET
+    
+    **Endpoint:** /api/libraries/{id