fix: 移除 mysqladmin/redis-cli 宿主机依赖，用 docker start + Prisma migrate 验证

CI 宿主机无 mysqladmin/redis-cli。MySQL/Redis 在 Docker 容器中。
- docker start 启动已有容器
- prisma migrate deploy 验证 MySQL 连接
- Gate E2E assertInfra() TCP 端口探测兜底

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

.gitea/workflows/deploy.yml

@@ -315,30 +315,6 @@ jobs:
           DATABASE_URL="${{ secrets.DATABASE_URL }}" npx prisma migrate deploy
         timeout-minutes: 5
 
-      - name: Wait for MySQL health
-        run: |
-          for i in $(seq 1 60); do
-            if mysqladmin ping -h 127.0.0.1 -u root --password="${{ secrets.DB_ROOT_PASSWORD || '' }}" 2>/dev/null; then
-              echo "MySQL ready" && exit 0
-            fi
-            echo "Waiting for MySQL... $i/60"
-            sleep 1
-          done
-          echo "ERROR: MySQL not ready after 60s" && exit 1
-        timeout-minutes: 2
-
-      - name: Wait for Redis health
-        run: |
-          for i in $(seq 1 30); do
-            if redis-cli ping 2>/dev/null | grep -q PONG; then
-              echo "Redis ready" && exit 0
-            fi
-            echo "Waiting for Redis... $i/30"
-            sleep 1
-          done
-          echo "ERROR: Redis not ready after 30s" && exit 1
-        timeout-minutes: 1
-
       - name: M-AI-03 Gate E2E
         run: |
           cd $WORKDIR