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/sidecar/Get System Configuration.yml

@@ -0,0 +1,36 @@
+info:
+  name: Get System Configuration
+  type: http
+  seq: 3
+http:
+  method: GET
+  url: '{{base_url}}/api/system/config'
+  auth: inherit
+  body:
+    type: none
+  headers:
+  - key: Authorization
+    value: Bearer {{admin_token
+
+docs: |-
+  ## Get System Configuration
+  
+    Retrieves system-wide configuration settings.
+  
+    **Method:** GET
+  
+    **Endpoint:** /api/system/config
+  
+    **Authentication:** Bearer token (admin only)
+  
+    **Response:**
+    - `base_url` (string): Base URL
+    - `opds_base_url` (string): OPDS endpoint URL
+    - `api_base_url` (string): API endpoint URL
+    - Additional configuration fields
+  
+    **Status Codes:**
+    - 200: Success
+    - 401: Unauthorized
+    - 403: Forbidden (admin only)
+    - 500: Internal server error