feat: guna MySQL external — host.docker.internal (dev) & 172.17.200.16 (prod)

- Buang service db dan volume dbdata dari compose files
- dev: extra_hosts host.docker.internal:host-gateway → capai MySQL Windows host
- prod: IP terus 172.17.200.16, tiada extra_hosts diperlukan
- .env.docker: DB_HOST=host.docker.internal dengan nota untuk production
- entrypoint.sh: default DB_HOST → host.docker.internal

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

docker-compose.prod.yml

@@ -4,12 +4,14 @@
 # Penggunaan:
 #   docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d --build
 #
+# DB external: 172.17.200.16:3306
+# Dalam .env (production): DB_HOST=172.17.200.16
+#
 # Perbezaan dari dev:
 #   • APP_ENV=production, APP_DEBUG=false
-#   • DB port TIDAK didedahkan ke host
-#   • Storage sijil/template disimpan dalam named volume (kekal semasa deploy)
-#   • Opcache validate_timestamps=0 (prestasi)
+#   • Storage sijil/template dalam named volume (kekal semasa redeploy)
 #   • php-dev.ini tidak dimuat
+#   • extra_hosts dibuang (IP terus boleh dicapai dari container)
 ###############################################################################
 name: ecert
 
@@ -20,15 +22,13 @@ services:
     container_name: ecert_app
     restart: always
     volumes:
-      # Kod dari server (git pull)
       - .:/var/www
-      # php.ini sahaja (tanpa php-dev.ini)
       - ./docker/php/php.ini:/usr/local/etc/php/conf.d/99-ecert.ini:ro
-      # Storage kekal semasa redeploy
       - storage_data:/var/www/storage
     environment:
       APP_ENV:   production
       APP_DEBUG: "false"
+    extra_hosts: []    # buang host.docker.internal, guna IP terus
 
   # ── Nginx (production) ─────────────────────────────────────────────────────
   nginx:
@@ -37,17 +37,8 @@ services:
     volumes:
       - .:/var/www:ro
       - ./docker/nginx/default.conf:/etc/nginx/conf.d/default.conf:ro
-      # Mount storage supaya nginx boleh serve fail statik jika perlu
       - storage_data:/var/www/storage:ro
 
-  # ── MySQL (production) ─────────────────────────────────────────────────────
-  db:
-    container_name: ecert_db
-    restart: always
-    ports: []    # Jangan dedahkan DB port ke luar dalam production
-    volumes:
-      - dbdata:/var/lib/mysql
-
   # ── Queue Worker (production) ──────────────────────────────────────────────
   queue:
     container_name: ecert_queue
@@ -58,6 +49,7 @@ services:
       - storage_data:/var/www/storage
     environment:
       APP_ENV: production
+    extra_hosts: []
 
 ###############################################################################
 volumes: