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>

packages/client-mobile/src/stores/connection.ts

@@ -150,7 +150,7 @@ export const useConnectionStore = defineStore('connection', () => {
       if (data.userTickets) {
         import('./voting').then(({ useVotingStore }) => {
           const votingStore = useVotingStore();
-          votingStore.syncFromServer(data.userTickets);
+          votingStore.syncFromServer(data.userTickets as Record<string, string | null>);
         });
       }
     });

packages/client-mobile/src/stores/voting.ts

@@ -9,6 +9,7 @@ export interface AwardConfig {
   name: string;
   icon: string;
   order: number;
+  remark?: string;
 }
 
 // 节目接口