feat: modularize codebase and add multi-route support with live reload

response.json

@@ -0,0 +1,8 @@
+{
+  "status": "success",
+  "message": "Hello from the Rust HTTP listener!",
+  "data": {
+    "id": 1,
+    "name": "Gemini CLI Sample"
+  }
+}