Fix migration 'Too many connections' error during deploy

- pm2 stop now uses --kill-timeout 10000 for graceful shutdown
- Wait 10s after stopping (was 3s) for MariaDB to reclaim connections
- Migration retries increased from 5 to 10 with 5s wait (was 3s)
- Total retry window: ~50s instead of ~15s

.gitea/workflows/deploy.yaml

@@ -338,21 +338,21 @@ jobs:
 
           echo "Cutover: stop service (free DB connections), migrate, swap .next..."
           CUTOVER_STARTED=1
-          pm2 stop next || true
-          # Give MariaDB a moment to reclaim the live pool.
-          sleep 3
+          pm2 stop next --kill-timeout 10000 || true
+          # Wait for PM2 to fully exit and MariaDB to reclaim connections.
+          sleep 10
 
           # Migrate only after live is stopped — avoids ER_CON_COUNT_ERROR while
           # the old process still holds DATABASE_POOL_SIZE connections.
           cd "${STAGE}"
           MIGRATE_OK=0
-          for i in 1 2 3 4 5; do
+          for i in $(seq 1 10); do
             if pnpm db:migrate; then
               MIGRATE_OK=1
               break
             fi
-            echo "migrate attempt ${i}/5 failed (likely DB connections), retrying..."
-            sleep 3
+            echo "migrate attempt ${i}/10 failed (likely DB connections), retrying..."
+            sleep 5
           done
           if [ "${MIGRATE_OK}" != "1" ]; then
             echo "ERROR: db:migrate failed after retries" >&2