feat: add task workflow and asset downloads

.env.example

@@ -2,9 +2,25 @@
 # Do not commit filled secret values.
 
 # Local server
+APP_PORT=3000
 PORT=3000
 HOSTNAME=127.0.0.1
 NEXT_PUBLIC_APP_URL=http://127.0.0.1:3000
+ZHINIAN_RUNTIME_DIR=.runtime
+ZHINIAN_PUBLIC_BASE_URL=http://127.0.0.1:3000
+
+# Public API v1 and worker task management.
+# Format: clientId:key,anotherClient:anotherKey
+ZHINIAN_API_KEYS=demo-agent:change-me-public-api-key
+ZHINIAN_INTERNAL_WORKER_TOKEN=change-me-worker-token
+ZHINIAN_WEBHOOK_SECRET=
+ZHINIAN_WORKER_BASE_URL=http://127.0.0.1:3000
+ZHINIAN_WORKER_INTERVAL_MS=5000
+ZHINIAN_WORKER_BATCH_SIZE=3
+ZHINIAN_WORKER_POLL_INTERVAL_MS=5000
+ZHINIAN_WORKER_LOCK_TIMEOUT_MS=300000
+ZHINIAN_WORKER_RETRY_BASE_MS=10000
+ZHINIAN_WORKER_RETRY_MAX_MS=300000
 
 # Supabase SaaS data layer. If empty, the app uses .runtime/data/web-app-state.json.
 NEXT_PUBLIC_SUPABASE_URL=
@@ -52,5 +68,5 @@ ALI_OSS_ENDPOINT=
 ALI_OSS_BUCKET=
 ALI_OSS_ACCESS_KEY_ID=
 ALI_OSS_ACCESS_KEY_SECRET=
-ALI_OSS_PREFIX=nianxxplay
+ALI_OSS_PREFIX=zhinian
 ALI_OSS_PUBLIC_BASE_URL=