feat: Docker Compose setup untuk development & production

- docker/php/Dockerfile: PHP 8.4-FPM + GD + imagick (PECL) + semua extension Laravel
- docker/php/php.ini: upload 20MB, memory 512MB, opcache, Asia/Kuala_Lumpur
- docker/php/php-dev.ini: validate_timestamps=1, display_errors=On (dev)
- docker/nginx/default.conf: gzip, security headers, static asset caching
- docker/entrypoint.sh: tunggu MySQL → migrate → seed AdminSeeder → cache (prod)
- docker-compose.yml: dev stack — port 8003, DB host 33060, queue worker
- docker-compose.prod.yml: production overrides — storage volume, no DB port exposed
- .env.docker: template env untuk Docker (DB_HOST=db)
- .dockerignore: exclude node_modules, vendor, .env, logs

fix: testGenerate try/catch kembalikan JSON error (bukan HTML 500)
fix: loadPreview() semak r.ok, tunjuk error alert, loading spinner

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

docker-compose.yml

@@ -0,0 +1,123 @@
+###############################################################################
+# eCert MBIP — Docker Compose (Development — Windows 11 / Linux)
+#
+# Penggunaan:
+#   docker compose up -d --build
+#
+# Aplikasi:    http://localhost:8003
+# DB (host):   localhost:33060  (untuk TablePlus / HeidiSQL)
+###############################################################################
+name: ecert
+
+services:
+
+  # ── PHP-FPM Application ────────────────────────────────────────────────────
+  app:
+    build:
+      context: .
+      dockerfile: docker/php/Dockerfile
+    container_name: ecert_app
+    restart: unless-stopped
+    working_dir: /var/www
+    volumes:
+      - .:/var/www
+      - ./docker/php/php.ini:/usr/local/etc/php/conf.d/99-ecert.ini:ro
+      - ./docker/php/php-dev.ini:/usr/local/etc/php/conf.d/99-ecert-dev.ini:ro
+    env_file:
+      - .env
+    environment:
+      APP_ENV: local
+      APP_DEBUG: "true"
+    depends_on:
+      db:
+        condition: service_healthy
+    networks:
+      - ecert
+
+  # ── Nginx Web Server ───────────────────────────────────────────────────────
+  nginx:
+    image: nginx:1.27-alpine
+    container_name: ecert_nginx
+    restart: unless-stopped
+    ports:
+      - "8003:80"
+    volumes:
+      - .:/var/www:ro
+      - ./docker/nginx/default.conf:/etc/nginx/conf.d/default.conf:ro
+    depends_on:
+      - app
+    networks:
+      - ecert
+
+  # ── MySQL 8.0 ──────────────────────────────────────────────────────────────
+  db:
+    image: mysql:8.0
+    container_name: ecert_db
+    restart: unless-stopped
+    environment:
+      MYSQL_DATABASE:      ${DB_DATABASE:-ecert_mbip}
+      MYSQL_ROOT_PASSWORD: ${DB_PASSWORD:-secret}
+      MYSQL_USER:          ${DB_USERNAME:-ecert}
+      MYSQL_PASSWORD:      ${DB_PASSWORD:-secret}
+    volumes:
+      - dbdata:/var/lib/mysql
+    ports:
+      - "33060:3306"    # port host 33060 → elak konflik dengan MySQL tempatan (3306)
+    healthcheck:
+      test:
+        - CMD
+        - mysqladmin
+        - ping
+        - -h
+        - localhost
+        - -u
+        - root
+        - --password=${DB_PASSWORD:-secret}
+      interval: 5s
+      timeout: 5s
+      retries: 15
+      start_period: 20s
+    networks:
+      - ecert
+
+  # ── Queue Worker ───────────────────────────────────────────────────────────
+  queue:
+    build:
+      context: .
+      dockerfile: docker/php/Dockerfile
+    container_name: ecert_queue
+    restart: unless-stopped
+    working_dir: /var/www
+    volumes:
+      - .:/var/www
+      - ./docker/php/php.ini:/usr/local/etc/php/conf.d/99-ecert.ini:ro
+    env_file:
+      - .env
+    environment:
+      APP_ENV: local
+    # Override entrypoint: langkau migrate/seed (app container dah buat)
+    entrypoint: []
+    command:
+      - php
+      - artisan
+      - queue:work
+      - --sleep=3
+      - --tries=3
+      - --max-time=3600
+      - --timeout=90
+    depends_on:
+      db:
+        condition: service_healthy
+      app:
+        condition: service_started
+    networks:
+      - ecert
+
+###############################################################################
+networks:
+  ecert:
+    driver: bridge
+
+volumes:
+  dbdata:
+    driver: local