chore: Add .gitignore for clean repository

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,45 @@
+# Dependencies
+node_modules/
+package-lock.json
+yarn.lock
+pnpm-lock.yaml
+
+# Build
+dist/
+build/
+.next/
+
+# Environment
+.env
+.env.local
+.env.*.local
+.env.development
+.env.test
+.env.production
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+.DS_Store
+
+# Logs
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Testing
+coverage/
+.nyc_output/
+
+# TypeScript
+*.tsbuildinfo
+tsconfig.tsbuildinfo
+
+# Misc
+.cache/
+tmp/
+temp/