fix: run activity import enforcement tests without pytest-asyncio

CI container only installs pytest; use asyncio.run() for async route handlers.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_activity_import_feature_enforcement.py

@@ -1,5 +1,6 @@
 """Feature-Enforcement für Legacy Activity CSV-Import (#37)."""
 
+import asyncio
 from unittest.mock import AsyncMock, patch
 
 import pytest
@@ -8,8 +9,7 @@ from fastapi import HTTPException
 from routers.activity import import_activity_csv
 
 
-@pytest.mark.asyncio
-async def test_import_activity_csv_blocks_when_limit_reached():
+def test_import_activity_csv_blocks_when_limit_reached():
     upload = AsyncMock()
     upload.read = AsyncMock(return_value=b"Workout Type,Start\n")
 
@@ -23,16 +23,17 @@ async def test_import_activity_csv_blocks_when_limit_reached():
         },
     ), patch("routers.activity.log_feature_usage"):
         with pytest.raises(HTTPException) as exc:
-            await import_activity_csv(
+            asyncio.run(
+                import_activity_csv(
                     file=upload,
                     x_profile_id=None,
                     session={"profile_id": "profile-1"},
                 )
+            )
     assert exc.value.status_code == 403
 
 
-@pytest.mark.asyncio
-async def test_import_activity_csv_increments_usage_per_insert(monkeypatch):
+def test_import_activity_csv_increments_usage_per_insert(monkeypatch):
     upload = AsyncMock()
     upload.read = AsyncMock(
         return_value=(
@@ -97,11 +98,13 @@ async def test_import_activity_csv_increments_usage_per_insert(monkeypatch):
         lambda _pid, feature: increments.append(feature),
     )
 
-    result = await import_activity_csv(
+    result = asyncio.run(
+        import_activity_csv(
             file=upload,
             x_profile_id=None,
             session={"profile_id": "profile-1"},
         )
+    )
 
     assert result["inserted"] == 1
     assert increments == ["activity_entries"]