feat: add theme

database/migrations/2026_06_15_100000_create_themes_table.php

@@ -0,0 +1,26 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('themes', function (Blueprint $table) {
+            $table->id();
+            $table->string('key')->unique();   // blue, pink, green, orange, purple
+            $table->string('name');            // display label
+            $table->json('colors');            // full color map (json works on MySQL & Postgres)
+            $table->integer('order')->default(0);
+            $table->boolean('is_active')->default(true);
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('themes');
+    }
+};

database/migrations/2026_06_15_100100_add_theme_id_to_scenes_table.php

@@ -0,0 +1,24 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('scenes', function (Blueprint $table) {
+            $table->foreignId('theme_id')->nullable()->after('id')
+                ->constrained('themes')->nullOnDelete();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('scenes', function (Blueprint $table) {
+            $table->dropForeign(['theme_id']);
+            $table->dropColumn('theme_id');
+        });
+    }
+};