Update .env.example with all variables and simplify .gitignore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.env.example

@@ -4,3 +4,18 @@ NODE_ENV=development
 
 # Dev Inspector
 REACT_EDITOR=code
+
+# Database
+DATABASE_URL=postgresql://user:password@localhost:5432/base-template
+DIRECT_URL=postgresql://user:password@localhost:5432/base-template
+
+# Google OAuth
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+
+# Role
+SUPER_ADMIN_EMAIL=admin@example.com
+
+# Telegram Notification (optional)
+TELEGRAM_NOTIFY_TOKEN=
+TELEGRAM_NOTIFY_CHAT_ID=

.gitignore

@@ -16,11 +16,8 @@ _.log
 report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
 
 # dotenv environment variable files
-.env
-.env.development.local
-.env.test.local
-.env.production.local
-.env.local
+.env*
+!.env.example
 
 # TanStack Router generated
 src/frontend/routeTree.gen.ts