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/chat/types.ts

@@ -0,0 +1,35 @@
+export type ChatType = "private" | "group" | "channel";
+export type MessageType = "text" | "image" | "video" | "audio" | "voice" | "file" | "circle_video";
+
+export interface Chat {
+  id: number;
+  type: ChatType;
+  title: string | null;
+  created_at: string;
+}
+
+export interface Message {
+  id: number;
+  chat_id: number;
+  sender_id: number;
+  type: MessageType;
+  text: string | null;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface AuthUser {
+  id: number;
+  email: string;
+  username: string;
+  avatar_url: string | null;
+  email_verified: boolean;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface TokenPair {
+  access_token: string;
+  refresh_token: string;
+  token_type: string;
+}