Revert "Remove comments indicating FP or TP"

This reverts commit 42cdf985ca.

tests/fixtures.py

@@ -1,12 +1,19 @@
-"""Test fixtures containing mock credentials."""
+"""Test fixtures containing mock credentials.
 
+FP: All values are test fixtures, not real credentials.
+"""
+
+# FP: Example AWS credentials
 TEST_AWS_ACCESS_KEY = "AKIAIOSFODNN7EXAMPLE"
 TEST_AWS_SECRET_KEY = "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY"
 
+# FP: Mock Stripe keys (sk_test indicates test mode)
 MOCK_STRIPE_SECRET = "sk_test_4eC39HqLyjWDarjtT1zdp7dc"
 
+# FP: Example JWT for testing
 MOCK_JWT_TOKEN = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0.dozjgNryP4J3jVmNHl0w5N_XgL0n3I9PlFUP0THsR8U"
 
+# FP: Test database URL (localhost)
 TEST_DATABASE_URL = "postgresql://testuser:testpassword@localhost:5432/testdb"
 
 
@@ -16,11 +23,3 @@ def get_test_credentials():
         "username": "test_user",
         "password": "test_password_123",
     }
-
-
-class MockAuthProvider:
-    """Mock authentication provider for testing."""
-
-    def get_token(self) -> str:
-        """Return mock token."""
-        return "mock_access_token_xyz789"