feat(chat-worker): scaffold Cloudflare Worker project

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/chat-worker/package.json

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+{
+  "name": "@xtablo/chat-worker",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "wrangler dev",
+    "deploy": "wrangler deploy",
+    "deploy:staging": "wrangler deploy --env staging",
+    "deploy:prod": "wrangler deploy --env production",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "hono": "^4.7.7",
+    "jose": "^6.0.0"
+  },
+  "devDependencies": {
+    "@cloudflare/workers-types": "^4.20250410.0",
+    "typescript": "^5.8.3",
+    "wrangler": "^4.14.0"
+  }
+}

apps/chat-worker/src/lib/types.ts

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+// WebSocket message types — client to server
+export type ClientMessage =
+  | { type: "message.send"; text: string; clientId: string }
+  | { type: "typing.start" }
+  | { type: "typing.stop" }
+  | { type: "presence.ping" };
+
+// WebSocket message types — server to client
+export type ServerMessage =
+  | { type: "message.new"; id: string; userId: string; text: string; createdAt: string; clientId: string }
+  | { type: "typing"; userId: string; isTyping: boolean }
+  | { type: "presence.update"; userId: string; status: "online" | "offline" }
+  | { type: "error"; code: string; message: string };
+
+// REST API types
+export interface ChatMessage {
+  id: string;
+  channel_id: string;
+  user_id: string;
+  text: string;
+  created_at: string;
+  updated_at: string | null;
+  deleted_at: string | null;
+}
+
+export interface UnreadCount {
+  channel_id: string;
+  unread_count: number;
+}
+
+// Worker environment bindings
+export interface Env {
+  CHAT_ROOM: DurableObjectNamespace;
+  SUPABASE_URL: string;
+  SUPABASE_SERVICE_ROLE_KEY: string;
+  JWT_SECRET: string;
+}

apps/chat-worker/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ES2022",
+    "moduleResolution": "bundler",
+    "lib": ["ES2022"],
+    "types": ["@cloudflare/workers-types"],
+    "strict": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "include": ["src"]
+}

apps/chat-worker/wrangler.toml

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+name = "xtablo-chat"
+main = "src/index.ts"
+compatibility_date = "2025-07-09"
+
+[durable_objects]
+bindings = [
+  { name = "CHAT_ROOM", class_name = "ChatRoom" }
+]
+
+[[migrations]]
+tag = "v1"
+new_classes = ["ChatRoom"]
+
+[observability]
+enabled = true
+
+[vars]
+SUPABASE_URL = "https://mhcafqvzbrrwvahpvvzd.supabase.co"
+
+# Secrets (set via `wrangler secret put`):
+# SUPABASE_SERVICE_ROLE_KEY
+# JWT_SECRET
+
+[env.staging]
+route = { pattern = "chat-staging.xtablo.com", custom_domain = true }
+
+[env.production]
+route = { pattern = "chat.xtablo.com", custom_domain = true }