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/Delete Account.yml

@@ -0,0 +1,25 @@
+info:
+  name: Delete Account
+  type: http
+  seq: 4
+http:
+  method: DELETE
+  url: '{{base_url}}/api/auth/account'
+  auth: inherit
+  body:
+    type: none
+
+docs: |-
+  ## Delete Account
+    
+    Permanently deletes user account and all associated data.
+    
+    **Method:** DELETE
+    
+    **Endpoint:** /api/auth/account
+    
+    **Authentication:** Required
+    
+    **Usage:**
+    - **Self-deletion**: DELETE /api/auth/account (no parameters)
+    - **Admin deletion**: DELETE /api/auth/account?user_id={uuid