feat: add Google OAuth, remote worker system, and file browser

- Google OAuth login with JWT session cookies, per-user project isolation
- Remote worker registration via WebSocket, execute_on_worker/list_workers agent tools
- File browser UI in workflow view, file upload/download API
- Deploy script switched to local build, added tori.euphon.cloud ingress

Makefile

@@ -1,4 +1,4 @@
-.PHONY: dev dev-backend dev-frontend build build-backend build-frontend clean deploy clippy lint docker-build
+.PHONY: dev dev-backend dev-frontend build build-backend build-frontend clean deploy clippy lint docker-build deploy-worker-i7
 
 # 开发模式：同时启动前后端
 dev:
@@ -36,6 +36,15 @@ clippy:
 
 lint: clippy
 
+# Worker 部署
+deploy-worker-i7:
+	@echo "==> Deploying tori-worker to i7..."
+	ssh i7 "mkdir -p ~/tori-worker ~/.config/systemd/user"
+	scp worker/tori-worker.py i7:~/tori-worker/tori-worker.py
+	scp worker/tori-worker.service i7:~/.config/systemd/user/tori-worker.service
+	ssh i7 "chmod +x ~/tori-worker/tori-worker.py && systemctl --user daemon-reload && systemctl --user enable --now tori-worker"
+	@echo "==> Done! Check status: ssh i7 'systemctl --user status tori-worker'"
+
 clean:
 	cargo clean
 	rm -rf web/dist web/node_modules