Implement chat backend and frontend scaffolding

Expanded chat backend with message reply, edit, delete, and reaction support in consumers and models. Updated routing to use chat_id. Added chat-related view stubs. On the frontend, introduced ChatLayout and ChatPage scaffolding, and routed protected routes through ChatLayout.

frontend/src/layouts/ChatLayout.tsx

@@ -0,0 +1,21 @@
+import Footer from "../components/Footer/footer";
+import { Outlet } from "react-router";
+import SiteNav, { type User } from "../components/navbar/SiteNav";
+
+
+const userexists: User = {
+  username: "Bruno",
+  email: "",
+  avatarUrl: "",
+};
+
+import styles from "./HomeLayout.module.css";
+
+export default function ChatLayout(){
+    return(
+        <div className={styles.root}>
+            <SiteNav user={userexists} onLogin={() => {}} onLogout={() => {}} />
+            <Outlet />
+        </div>
+    )
+}