fix: resolve Pydantic v2 compatibility and conftest path issues

- Remove duplicate Config class from BaseAITBCConfig (Pydantic v2 compatibility)
- Update conftest.py to use DATA_DIR and LOG_DIR constants directly
- Fix TypeError: get_log_path() missing required argument
- Tests now run successfully with PYTHONPATH set

aitbc/config.py

@@ -42,12 +42,6 @@ class BaseAITBCConfig(BaseSettings):
         description="Log format string"
     )
 
-    class Config:
-        """Pydantic configuration"""
-        env_file = str(ENV_FILE)
-        env_file_encoding = "utf-8"
-        case_sensitive = False
-
 
 class AITBCConfig(BaseAITBCConfig):
     """

tests/conftest.py

@@ -16,7 +16,7 @@ sys.path.insert(0, str(project_root))
 sys.path.insert(0, str(project_root / "aitbc"))
 
 # Import aitbc utilities for conftest
-from aitbc import get_data_path, get_log_path
+from aitbc import DATA_DIR, LOG_DIR
 
 # Add necessary source paths
 sys.path.insert(0, str(project_root / "packages" / "py" / "aitbc-core" / "src"))
@@ -50,9 +50,9 @@ sys.path.insert(0, str(project_root / "apps" / "coordinator-api"))
 
 # Set up test environment
 os.environ["TEST_MODE"] = "true"
-os.environ["AUDIT_LOG_DIR"] = str(get_log_path() / "audit")
+os.environ["AUDIT_LOG_DIR"] = str(LOG_DIR / "audit")
 os.environ["TEST_DATABASE_URL"] = "sqlite:///:memory:"
-os.environ["DATA_DIR"] = str(get_data_path())
+os.environ["DATA_DIR"] = str(DATA_DIR)
 
 # Mock missing optional dependencies
 sys.modules['slowapi'] = Mock()