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/server/Dockerfile

@@ -23,6 +23,9 @@ RUN pnpm build
 WORKDIR /app/packages/server
 RUN pnpm build
 
+# Generate Prisma Client in builder stage
+RUN npx prisma generate
+
 # Production stage
 FROM node:20-alpine AS production
 
@@ -39,9 +42,15 @@ COPY --from=builder /app/pnpm-lock.yaml ./
 COPY --from=builder /app/packages/server/package.json ./packages/server/
 COPY --from=builder /app/packages/shared ./packages/shared
 
+# Copy Prisma schema
+COPY --from=builder /app/packages/server/prisma ./packages/server/prisma
+
 # Install production dependencies only
 RUN pnpm install --prod --frozen-lockfile
 
+# Copy generated Prisma Client from builder stage (pnpm workspace location)
+COPY --from=builder /app/node_modules/.pnpm ./node_modules/.pnpm
+
 # Copy built files
 COPY --from=builder /app/packages/server/dist ./packages/server/dist
 COPY --from=builder /app/packages/server/src/lua ./packages/server/lua