Document flow's API under /v1

Claude-Session: https://claude.ai/code/session_011i2AG9nwpiKUCVxAdDzYuU

docs/versioned_docs/version-1.9.0/API-Reference/python-examples/workflows-api/example-request.py

@@ -9,7 +9,7 @@ api_key = os.environ.get("FLOW_API_KEY", "")
 headers = {"Content-Type": "application/json", "x-api-key": api_key}
 
 start = requests.post(
-    f"{base}/api/v2/workflows",
+    f"{base}/v1/workflows",
     headers=headers,
     json={"flow_id": flow_id, "background": True, "stream": False, "inputs": {}},
     timeout=60,