fix: add MySQL database and fix deployment issues

## Changes

### Database Integration
- Add MySQL 8.0 service to docker-compose.yml
- Configure DATABASE_URL environment variable for server
- Add health check for MySQL service
- Create mysql_data volume for data persistence

### Dockerfile Improvements
- Generate Prisma Client in builder stage
- Copy Prisma Client from correct pnpm workspace location
- Ensure Prisma Client is available in production container

### Client-Mobile Fixes
- Remove deprecated StampDock.vue component
- Fix voting store API usage in VotingPage.vue
- Add type assertion for userTickets in connection.ts
- Add remark property to AwardConfig interface in voting.ts

## Testing
- All containers start successfully
- Database connection established
- Redis connection working
- 94 participants restored from Redis
- Vote data synced (20 votes)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -1,6 +1,25 @@
 version: '3.8'
 
 services:
+  mysql:
+    image: mysql:8.0
+    container_name: gala-mysql
+    restart: unless-stopped
+    environment:
+      - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD:-gala_root_pass}
+      - MYSQL_DATABASE=${MYSQL_DATABASE:-gala_db}
+      - MYSQL_USER=${MYSQL_USER:-gala_user}
+      - MYSQL_PASSWORD=${MYSQL_PASSWORD:-gala_pass}
+    volumes:
+      - mysql_data:/var/lib/mysql
+    networks:
+      - gala-network
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
   redis:
     image: redis:7-alpine
     container_name: gala-redis
@@ -22,8 +41,12 @@ services:
       - REDIS_HOST=redis
       - REDIS_PORT=6379
       - CORS_ORIGINS=${CORS_ORIGINS:-*}
+      - DATABASE_URL=mysql://${MYSQL_USER:-gala_user}:${MYSQL_PASSWORD:-gala_pass}@mysql:3306/${MYSQL_DATABASE:-gala_db}
     depends_on:
-      - redis
+      mysql:
+        condition: service_healthy
+      redis:
+        condition: service_started
     networks:
       - gala-network
 
@@ -49,6 +72,7 @@ services:
       - gala-network
 
 volumes:
+  mysql_data:
   redis_data:
   caddy_data:
   caddy_config: