Fix type inference error for api_key after removing ApiKey auth mode

Both match arms now return None, so Rust needs an explicit type
annotation for the Option<String>.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src-tauri/src/commands/project_commands.rs

@@ -125,7 +125,7 @@ pub async fn start_project_container(
     let image_name = container_config::resolve_image_name(&settings.image_source, &settings.custom_image_name);
 
     // Get API key only if auth mode requires it
-    let api_key = match project.auth_mode {
+    let api_key: Option<String> = match project.auth_mode {
         AuthMode::Anthropic => {
             None
         }