Update Bruno requests: add Update Theme endpoint and include theme in responses

bruno/auth/Get Profile.bru

@@ -30,6 +30,7 @@ docs {
   - `id` (string): User ID
   - `email` (string): Email
   - `username` (string): Username
+  - `theme` (string): User theme preference
   
   **Status Codes:**
   - 200: Success

bruno/auth/Login User.bru

@@ -46,6 +46,10 @@ docs {
   **Response:**
   - `token` (string): JWT token
   - `user` (object): User details
+    - `id` (string): User ID
+    - `email` (string): Email
+    - `username` (string): Username
+    - `theme` (string): User theme preference
   
   **Status Codes:**
   - 200: Success

bruno/auth/Register User.bru

@@ -47,6 +47,10 @@ docs {
   **Response:**
   - `token` (string): JWT token
   - `user` (object): User details
+    - `id` (string): User ID
+    - `email` (string): Email
+    - `username` (string): Username
+    - `theme` (string): User theme preference
 
   **Status Codes:**
   - 201: Created

bruno/auth/Update Theme.bru

@@ -0,0 +1,40 @@
+meta {
+  name: Update Theme
+  type: http
+  seq: 4
+}
+
+put {
+  url: {{base_url}}/api/auth/theme
+  body: json
+  auth: inherit
+}
+
+body:json {
+  {
+    "theme": "dracula"
+  }
+}
+
+docs {
+  ## Update User Theme
+
+  Updates the authenticated user's theme preference.
+
+  **Method:** PUT
+
+  **Endpoint:** /api/auth/theme
+
+  **Authentication:** Required (Bearer token)
+
+  **Request Body:**
+  - `theme` (string): Theme name (tokyo-night, dracula, nord, solarized-dark, monokai, one-dark-pro, material-dark)
+
+  **Response:**
+  - `message` (string): Success message
+
+  **Status Codes:**
+  - 200: Success
+  - 400: Invalid theme
+  - 401: Unauthorized
+}