Implement server running preference and cleanup on exit

- Added `setKeepServerRunning` function to manage server persistence on app close.
- Integrated server running preference in `ConnectionForm` and synced settings on app startup.
- Enhanced server management in `main.rs` to handle orphaned processes based on user preference.
- Improved cleanup logic to ensure proper termination of server processes when not set to keep running.

app/src/lib/tauri.ts

@@ -54,6 +54,21 @@ export async function stopServer(): Promise<void> {
   }
 }
 
+/**
+ * Set whether the server should keep running when the app closes (Tauri only)
+ */
+export async function setKeepServerRunning(keepRunning: boolean): Promise<void> {
+  if (!isTauri()) {
+    return;
+  }
+
+  try {
+    await invoke('set_keep_server_running', { keepRunning });
+  } catch (error) {
+    console.error('Failed to set keep server running setting:', error);
+  }
+}
+
 /**
  * Setup window close handler to check setting and stop server if needed
  */