feat: AddUserTitle implemented

api/schemas/updateUser.yaml

@@ -0,0 +1,26 @@
+type: object
+properties:
+  avatar_id:
+    type: integer
+    format: int64
+    nullable: true
+    description: ID of the user avatar (references `images.id`); set to `null` to remove avatar
+    example: 42
+  mail:
+    type: string
+    format: email
+    pattern: '^[a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\\.[a-zA-Z0-9_-]+$'
+    description: User email (must be unique and valid)
+    example: john.doe.updated@example.com
+  disp_name:
+    type: string
+    description: Display name
+    maxLength: 32
+    example: John Smith
+  user_desc:
+    type: string
+    description: User description / bio
+    maxLength: 512
+    example: Just a curious developer.
+additionalProperties: false
+description: Only provided fields are updated. Omitted fields remain unchanged.