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/user/admin/scenarios/Delete User Account (Admin).yml

@@ -0,0 +1,19 @@
+info:
+  name: Delete User Account (Admin)
+  type: http
+  seq: 6
+http:
+  method: DELETE
+  url: '{{base_url}}/api/auth/account?user_id={{user_id}}'
+  auth: inherit
+  body:
+    type: none
+
+docs: |-
+  ## Delete User Account (Admin)
+    
+    Allows administrators to delete any user account by specifying user_id parameter.
+    
+    **Method:** DELETE
+    
+    **Endpoint:** /api/auth/account?user_id={user_id