feat: create independent server app for Vercel deployment

- Create apps/server package with all necessary files
- Add package.json with ObjectStack dependencies
- Create objectstack.config.ts with plugin configuration
- Add server/index.ts entrypoint with Hono adapter
- Create API handler (api/[[...route]].js) for Vercel
- Add build scripts (build-vercel.sh, bundle-api.mjs)
- Configure Vercel deployment (vercel.json)
- Add environment config (.env.example)
- Create .gitignore and .vercelignore
- Add tsconfig.json for TypeScript compilation
- Write comprehensive README.md
- Write detailed DEPLOYMENT.md guide

Agent-Logs-Url: https://github.com/objectstack-ai/objectui/sessions/1401bb2d-d094-4280-a66d-bee5388fc83a

Co-authored-by: xuyushun441-sys <255036401+xuyushun441-sys@users.noreply.github.com>

Author: Claude

apps/server/.env.example

@@ -0,0 +1,16 @@
+# Environment Variables for ObjectUI Server
+
+# Authentication Secret (REQUIRED in production)
+# Must be at least 32 characters
+AUTH_SECRET=dev-secret-please-change-in-production-min-32-chars
+
+# Base URL for the application
+# Leave empty to auto-detect from VERCEL_URL on Vercel
+# Set explicitly for custom domains
+# NEXT_PUBLIC_BASE_URL=https://your-domain.com
+
+# Runtime Mode (automatically set during build)
+# VITE_RUNTIME_MODE=server
+
+# Server URL (automatically set during build)
+# VITE_SERVER_URL=

apps/server/.gitignore

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+# Dependencies
+node_modules/
+.pnpm-store/
+
+# Build outputs
+dist/
+api/_handler.js
+api/_handler.js.map
+public/
+
+# Environment
+.env
+.env.local
+.env.*.local
+
+# Logs
+*.log
+npm-debug.log*
+pnpm-debug.log*
+
+# OS
+.DS_Store
+Thumbs.db
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Vercel
+.vercel

apps/server/.vercelignore

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+# Vercel build artifacts
+node_modules/
+.pnpm-store/
+dist/
+
+# Test files
+*.test.ts
+*.spec.ts
+__tests__/
+test/
+
+# Source files (only need compiled output)
+*.ts
+!api/**/*.js
+!scripts/**/*.mjs
+
+# Config files
+tsconfig.json
+vitest.config.ts
+postcss.config.js
+tailwind.config.js
+
+# Documentation
+*.md
+!README.md
+
+# Git
+.git/
+.gitignore