chore: scaffold web, worker, and compose stack

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,35 @@
+services:
+  db:
+    image: postgres:17
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+      POSTGRES_DB: ${POSTGRES_DB}
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  web:
+    build: ./web
+    environment:
+      DATABASE_URL: ${DATABASE_URL}
+    ports:
+      - "3000:3000"
+    depends_on:
+      db:
+        condition: service_healthy
+
+  worker:
+    build: ./worker
+    environment:
+      DATABASE_URL: ${DATABASE_URL}
+    depends_on:
+      db:
+        condition: service_healthy
+
+volumes:
+  postgres-data: