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/devices/scenarios/Remove Book from Kobo Shelf.yml

@@ -0,0 +1,22 @@
+info:
+  name: Remove Book from Kobo Shelf
+  type: http
+  seq: 1
+http:
+  method: DELETE
+  url: '{{baseURL}}/api/devices/{{deviceID}}/shelves?media_item_id={{bookUUID}}'
+  auth: inherit
+  body:
+    type: none
+  headers:
+  - key: Authorization
+    value: Bearer {{userToken
+
+docs: |-
+  ## Remove Book from Kobo Shelf
+  
+    Remove a specific book from a Kobo device shelf, preventing it from syncing to that device.
+  
+    **Method:** DELETE
+  
+    **Endpoint:** /api/devices/{deviceID