fix: inttest runner crash and minio bucket-init proxy issue

- Remove --profiling-output arg from runner.yaml (plugin uses default path)
- Inline profiling hooks in root conftest.py with graceful fallback
- Replace mc-based bucket-init with Python urllib (no proxy interference)
- Add explicit ProxyHandler({}) to guarantee no proxy usage in bucket-init

tests/integration/conftest.py

@@ -16,6 +16,7 @@ from typing import Any
 
 import httpx
 import pytest
+import pytest_asyncio
 
 from tests.integration.profiler import EndpointProfiler
 from tests.integration.seed_sandbox import (
@@ -34,9 +35,6 @@ from tests.integration.seed_sandbox import (
     SEED_VARIANT_IDS,
 )
 
-# Profiling plugin loaded via root conftest.py (pytest_plugins must be top-level)
-
-
 # ---------------------------------------------------------------------------
 # ProfiledAsyncClient — transparent timing wrapper
 # ---------------------------------------------------------------------------
@@ -129,7 +127,7 @@ def trading_api_url() -> str:
 # ---------------------------------------------------------------------------
 
 
-@pytest.fixture
+@pytest_asyncio.fixture
 async def query_client(
     query_api_url: str, profiler: EndpointProfiler,
 ) -> ProfiledAsyncClient:
@@ -138,7 +136,7 @@ async def query_client(
         yield ProfiledAsyncClient(client, profiler)
 
 
-@pytest.fixture
+@pytest_asyncio.fixture
 async def registry_client(
     registry_api_url: str, profiler: EndpointProfiler,
 ) -> ProfiledAsyncClient:
@@ -147,7 +145,7 @@ async def registry_client(
         yield ProfiledAsyncClient(client, profiler)
 
 
-@pytest.fixture
+@pytest_asyncio.fixture
 async def risk_client(
     risk_api_url: str, profiler: EndpointProfiler,
 ) -> ProfiledAsyncClient:
@@ -156,7 +154,7 @@ async def risk_client(
         yield ProfiledAsyncClient(client, profiler)
 
 
-@pytest.fixture
+@pytest_asyncio.fixture
 async def trading_client(
     trading_api_url: str, profiler: EndpointProfiler,
 ) -> ProfiledAsyncClient: