fix CI lockfile sync and simplify Docker docs.

Regenerate package-lock for npm ci, bump Node to 22, and trim compose env to secrets only.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.yml

@@ -3,13 +3,10 @@ services:
     build: .
     container_name: sejong-tv
     restart: unless-stopped
-    env_file: .env
     environment:
-      DATABASE_URL: file:/app/data/sejong.db
-      HOST: 0.0.0.0
-      PORT: 3000
-      NITRO_HOST: 0.0.0.0
-      NITRO_PORT: 3000
+      JWT_SECRET: change-me-to-a-long-random-string
+      ADMIN_USERNAME: admin
+      ADMIN_PASSWORD: change-me
     volumes:
       - sqlite_data:/app/data
     ports: