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/opds/scenarios/Get Device Catalog - Bearer.yml

@@ -0,0 +1,16 @@
+info:
+  name: Get Device Catalog - Bearer
+  type: http
+  seq: 1
+http:
+  method: GET
+  url: '{{opds_base_url}}/opds/devices/{{device_id}}/catalog'
+
+docs: |-
+  ## Get Device OPDS Catalog - Bearer
+  
+    Tests OPDS device catalog retrieval using Bearer token authentication.
+  
+    **Method:** GET
+  
+    **Endpoint:** /opds/devices/{device_id