feat: add comprehensive .gitignore file

- Ignore node_modules, build files, and dependencies
- Exclude environment files and IDE configurations
- Add backend and admin specific ignores for future development
- Cover OS generated files and temporary files

.gitignore

@@ -0,0 +1,95 @@
+# Dependencies
+node_modules/
+*/node_modules/
+
+# Next.js build output
+.next/
+out/
+build/
+
+# Production builds
+dist/
+build/
+
+# Development files
+.DS_Store
+*.log
+*.log.*
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# Environment variables
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# IDE and editor files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# TypeScript
+*.tsbuildinfo
+next-env.d.ts
+
+# Vercel
+.vercel
+
+# Testing
+coverage/
+.nyc_output/
+
+# Locking files
+package-lock.json
+yarn.lock
+bun.lockb
+
+# Cache directories
+.cache/
+.parcel-cache/
+.npm/
+.yarn/
+
+# Temporary files
+*.tmp
+*.temp
+.tmp/
+.temp/
+
+# Backend specific
+backend/node_modules/
+backend/.env
+backend/dist/
+backend/build/
+backend/uploads/
+backend/logs/
+
+# Admin specific
+admin/node_modules/
+admin/.env
+admin/dist/
+admin/build/
+
+# Database
+*.db
+*.sqlite
+*.sqlite3
+
+# Logs
+logs/
+*.log