Update .gitignore to exclude environment files

- Add .env files to .gitignore (contains secrets)
- Fix repository remote configuration

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

.gitignore

@@ -4,3 +4,8 @@ dist
 server/public
 vite.config.ts.*
 *.tar.gz
+
+# Environment variables (contains secrets)
+.env
+.env.local
+.env.*.local