feat: Complete production deployment pipeline with admin dashboard

- Add unified deployment script with Node.js 22 installation
- Create comprehensive database migration script (28 migrations + admin tables)
- Add production start/stop scripts for all services
- Integrate admin dashboard (parentflow-admin) into PM2 ecosystem
- Configure all services: Backend (3020), Frontend (3030), Admin (3335)
- Update ecosystem.config.js with admin dashboard configuration
- Add invite codes module for user registration management

parentflow-admin/.gitignore

@@ -0,0 +1,41 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/versions
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# env files (can opt-in for committing if needed)
+.env*
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts