Fix: Add .env to .gitignore and create .env.example

- Uncomment .env in .gitignore to prevent accidental commits
- Remove .env from git tracking
- Add .env.example with placeholder values for documentation
- Fixes security issue where .env was committed with credentials

.gitignore

@@ -24,5 +24,5 @@ dist-ssr
 *.sw?
 
 # Environment
-#.env
+.env
 .env.local