fix: resolve circular import for User-Agent version string

Author: 1bcMax

blockrun_llm/client.py

@@ -60,13 +60,14 @@
     validate_resource_url,
 )
 
-from . import __version__
-
 # Load environment variables
 load_dotenv()
 
 # User-Agent for client identification in server logs
-USER_AGENT = f"blockrun-python/{__version__}"
+# Version read lazily to avoid circular import with __init__.py
+def _get_user_agent() -> str:
+    from . import __version__
+    return f"blockrun-python/{__version__}"
 
 
 # =============================================================================
@@ -408,7 +409,7 @@ def _request_with_payment(self, endpoint: str, body: Dict[str, Any]) -> ChatResp
         response = self._client.post(
             url,
             json=body,
-            headers={"Content-Type": "application/json", "User-Agent": USER_AGENT},
+            headers={"Content-Type": "application/json", "User-Agent": _get_user_agent()},
         )
 
         # Handle 402 Payment Required
@@ -505,7 +506,7 @@ def _handle_payment_and_retry(
             json=body,
             headers={
                 "Content-Type": "application/json",
-                "User-Agent": USER_AGENT,
+                "User-Agent": _get_user_agent(),
                 "PAYMENT-SIGNATURE": payment_payload,
             },
             timeout=request_timeout,
@@ -832,7 +833,7 @@ async def _request_with_payment(self, endpoint: str, body: Dict[str, Any]) -> Ch
         response = await self._client.post(
             url,
             json=body,
-            headers={"Content-Type": "application/json", "User-Agent": USER_AGENT},
+            headers={"Content-Type": "application/json", "User-Agent": _get_user_agent()},
         )
 
         if response.status_code == 402:
@@ -909,7 +910,7 @@ async def _handle_payment_and_retry(
                 json=body,
                 headers={
                     "Content-Type": "application/json",
-                    "User-Agent": USER_AGENT,
+                    "User-Agent": _get_user_agent(),
                     "PAYMENT-SIGNATURE": payment_payload,
                 },
             )