Add .gitignore with Next.js, TypeScript, and shadcn/ui support

.gitignore

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+# ───────────────────────────────
+# Node.js / npm / pnpm
+# ───────────────────────────────
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+package-lock.json
+.pnpm-debug.log*
+.pnpm-store/
+
+# ───────────────────────────────
+# Environment Files
+# ───────────────────────────────
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Example envs are safe to commit
+!.env.example
+
+# ───────────────────────────────
+# Build Artifacts
+# ───────────────────────────────
+dist/
+build/
+.cache/
+.tmp/
+.next/
+out/
+coverage/
+logs/
+*.log
+*.pid
+*.seed
+*.pid.lock
+
+# ───────────────────────────────
+# Docker
+# ───────────────────────────────
+docker-data/
+docker-redis/
+volumes/
+docker-compose.override.yml
+
+# ───────────────────────────────
+# TypeScript
+# ───────────────────────────────
+*.tsbuildinfo
+tsconfig.tsbuildinfo
+*.d.ts.map
+
+# ───────────────────────────────
+# shadcn / Tailwind / Next.js
+# ───────────────────────────────
+.next/
+.next/cache/
+.next/static/
+.next/server/
+.next/types/
+.next/output/
+public/build/
+.turbo/
+.turbopack/
+tailwind.config.js.timestamp*
+postcss.config.js.timestamp*
+*.vercel
+.vercel
+.storybook/
+.vitest/
+.vitest-temp/
+
+# ───────────────────────────────
+# Redis dump and cache
+# ───────────────────────────────
+dump.rdb
+*.rdb
+*.aof
+
+# ───────────────────────────────
+# Backend temporary files
+# ───────────────────────────────
+backend/node_modules/
+backend/npm-debug.log*
+backend/.env
+backend/.cache
+backend/.next
+backend/.turbo
+backend/dist/
+backend/build/
+
+# ───────────────────────────────
+# Frontend temporary files
+# ───────────────────────────────
+frontend/node_modules/
+frontend/npm-debug.log*
+frontend/.env
+frontend/.cache
+frontend/.next
+frontend/.turbo
+frontend/dist/
+frontend/build/
+
+# ───────────────────────────────
+# Editor / OS Specific
+# ───────────────────────────────
+.DS_Store
+Thumbs.db
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# ───────────────────────────────
+# Coverage / Testing
+# ───────────────────────────────
+coverage/
+.nyc_output/
+jest-results/
+test-results/
+cypress/screenshots/
+cypress/videos/
+playwright-report/
+test-output/
+
+# ───────────────────────────────
+# Miscellaneous
+# ───────────────────────────────
+*.bak
+*.tmp
+*.tgz
+*.orig
+*.rej
+*.local
+.envrc
+.envrc.bak