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/Reject Device Registration.yml

@@ -0,0 +1,38 @@
+info:
+  name: Reject Device Registration
+  type: http
+  seq: 7
+http:
+  method: POST
+  url: '{{base_url}}/api/devices/reject/{{registration_id}}'
+  auth: inherit
+  body:
+    type: none
+
+docs: |-
+  ## Reject Device Registration
+  
+    Rejects a pending device registration request.
+  
+    **Method:** POST
+  
+    **Endpoint:** /api/devices/reject/:registration_id
+  
+    **Authentication:** Bearer token
+  
+    **Path Parameters:**
+     - `registration_id` (string): Registration request UUID
+  
+    **Response:**
+     - Success message confirming rejection
+  
+    **Status Codes:**
+     - 200: Success
+     - 401: Unauthorized
+     - 404: Registration not found
+     - 400: Invalid registration status
+  
+     **Example Response:**
+      ```json
+      {
+        "message": "device registration rejected"