feat: add theme update

routes/api.php

@@ -202,6 +202,8 @@
     /// themes (color themes a scene can use)
     Route::get('/themes', [ThemeController::class, 'index']);
     Route::get('/themes/{id}', [ThemeController::class, 'show']);
+    Route::put('/themes/{id}', [ThemeController::class, 'update']);   // edit name / colors / order / active
+    Route::post('/themes/{id}', [ThemeController::class, 'update']);  // same, for method-spoofed clients
 
     /// scenes (تنظیمات صحنه) — each scene has an image, optional video, and sound
     // Consolidated settings screen (all scenes + current user's preferences) in one call.