feat(deploy): switch to Oracle MySQL, separate CI runner, docker-compose deploy

- Prisma schema: sqlite → mysql provider
- Migration SQL rewritten as MySQL DDL (utf8mb4, DATETIME(3), AUTO_INCREMENT)
- Add migration_lock.toml for mysql provider
- Dockerfile.backend: drop node:22/sqlite deps, use node:20-slim
- entrypoint.sh: replace SQLite first-run logic with prisma migrate deploy + db seed
- docker-compose.prod.yml: production compose for /opt/webapps/okr on web VPS
  - reads DB creds from /opt/webapps/webapp-mysql.env
  - reads app secrets from /opt/webapps/okr/.env.app (written by CI)
  - port 80 (frontend), no conflict with Gitea 3000/Vault 8200
- ci.yml deploy-okr: moves from ubuntu-latest (web VPS) to ci-runner (161.33.149.243)
  - builds images on CI runner VPS (no heavy build on web/Gitea VPS)
  - transfers images via docker save | gzip | ssh | docker load
  - deploys via SSH + docker compose up on web VPS
- scripts/setup-ci-runner.sh: one-time setup script for CI runner VPS

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

AINative_OKR_CASAN5/scripts/setup-ci-runner.sh

@@ -0,0 +1,93 @@
+#!/usr/bin/env bash
+# Setup act_runner on the CI runner VPS (161.33.149.243).
+#
+# Prerequisites (run on CI runner VPS as ubuntu):
+#   1. Get a runner registration token from Gitea:
+#      http://161.33.139.73:3000 → Site Administration → Runners → "Create Runner"
+#   2. Generate a deploy SSH key for accessing the web VPS:
+#      ssh-keygen -t ed25519 -f /tmp/deploy_key -N ""
+#      ssh-copy-id -i /tmp/deploy_key.pub ubuntu@161.33.139.73
+#      Add /tmp/deploy_key (private) as Gitea secret: DEPLOY_SSH_KEY
+#      rm /tmp/deploy_key
+#
+# Usage:
+#   RUNNER_TOKEN=<token-from-gitea> bash setup-ci-runner.sh
+#
+set -euo pipefail
+
+GITEA_URL="http://161.33.139.73:3000"
+RUNNER_NAME="casan-ci-runner"
+RUNNER_VERSION="v0.2.12"
+INSTALL_DIR="/opt/act-runner"
+
+if [[ -z "${RUNNER_TOKEN:-}" ]]; then
+  echo "ERROR: RUNNER_TOKEN env var is required."
+  echo "  Get it from: $GITEA_URL → Site Administration → Runners → Create Runner"
+  exit 1
+fi
+
+echo "=== Installing act_runner $RUNNER_VERSION ==="
+sudo mkdir -p "$INSTALL_DIR"
+sudo curl -fsSL \
+  "https://gitea.com/gitea/act_runner/releases/download/${RUNNER_VERSION}/act_runner-${RUNNER_VERSION}-linux-amd64" \
+  -o "$INSTALL_DIR/act_runner"
+sudo chmod +x "$INSTALL_DIR/act_runner"
+
+echo "=== Writing runner config ==="
+sudo tee "$INSTALL_DIR/config.yaml" > /dev/null <<'CONFIG'
+log:
+  level: info
+
+runner:
+  name: "casan-ci-runner"
+  capacity: 1
+  labels:
+    - "ci-runner:docker://catthehacker/ubuntu:act-22.04"
+  fetch_interval: 5s
+  fetch_timeout: 60s
+
+container:
+  # host network so the job container can reach Gitea at 161.33.139.73:3000
+  network: host
+  # 2 GB RAM available on CI runner — builds need up to 1.5 GB
+  options: "--memory 1536m --cpus 1.5"
+  valid_volumes:
+    - "**"
+CONFIG
+
+echo "=== Registering runner with Gitea ==="
+cd "$INSTALL_DIR"
+sudo ./act_runner register \
+  --instance "$GITEA_URL" \
+  --token "$RUNNER_TOKEN" \
+  --name "$RUNNER_NAME" \
+  --no-interactive
+
+echo "=== Installing systemd service ==="
+sudo tee /etc/systemd/system/act-runner.service > /dev/null <<'SERVICE'
+[Unit]
+Description=Gitea act_runner (CI builds)
+After=docker.service
+Requires=docker.service
+
+[Service]
+User=ubuntu
+Group=docker
+WorkingDirectory=/opt/act-runner
+ExecStart=/opt/act-runner/act_runner daemon --config /opt/act-runner/config.yaml
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
+SERVICE
+
+sudo systemctl daemon-reload
+sudo systemctl enable act-runner
+sudo systemctl start act-runner
+
+echo ""
+echo "=== CI runner setup complete ==="
+echo "Check status: sudo systemctl status act-runner"
+echo "View logs:    sudo journalctl -u act-runner -f"
+echo "Verify in Gitea: $GITEA_URL/-/admin/runners"