Add web client and containerized deployment stack

Web client:

- Added React + TypeScript + Vite + Tailwind application in web/.

- Implemented auth, chat list, chat messages, typing indicators, file uploads, and voice recording/playback.

- Added typed API layer, Zustand stores, and realtime websocket hook integration.

Containerization:

- Added backend Dockerfile and project .dockerignore.

- Added web multi-stage Dockerfile with nginx static hosting and API/WS reverse proxy.

- Added full docker-compose stack with postgres, redis, minio, backend, worker, mailpit, and web.

- Added MinIO bucket bootstrap init job and updated README with Docker quick-start.

web/src/components/ChatList.tsx

@@ -0,0 +1,25 @@
+import { useChatStore } from "../store/chatStore";
+
+export function ChatList() {
+  const chats = useChatStore((s) => s.chats);
+  const activeChatId = useChatStore((s) => s.activeChatId);
+  const setActiveChatId = useChatStore((s) => s.setActiveChatId);
+
+  return (
+    <aside className="w-full max-w-xs border-r border-slate-700 bg-panel">
+      <div className="border-b border-slate-700 p-3 text-sm font-semibold">Chats</div>
+      <div className="max-h-[calc(100vh-56px)] overflow-auto">
+        {chats.map((chat) => (
+          <button
+            className={`block w-full border-b border-slate-800 px-3 py-3 text-left ${activeChatId === chat.id ? "bg-slate-800" : "hover:bg-slate-800/40"}`}
+            key={chat.id}
+            onClick={() => setActiveChatId(chat.id)}
+          >
+            <p className="font-medium">{chat.title || `${chat.type} #${chat.id}`}</p>
+            <p className="text-xs text-slate-400">{chat.type}</p>
+          </button>
+        ))}
+      </div>
+    </aside>
+  );
+}