chore: update gitignore and remove env.example

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

.gitignore

@@ -40,6 +40,9 @@ logs/
 .claude/
 .worktrees/
 
+# Demo (excluded from version control)
+demo/
+
 # Lock files (use in development, commit in production)
 # uv.lock - uncomment if you want to commit lock file
 # package-lock.json - uncomment if you want to commit lock file

frontend/.env.example

@@ -1 +0,0 @@
-VITE_API_URL=http://127.0.0.1:3337