Fix: Format api_key.py to pass CI Black check

Author: parvenuprompting

app/models/api_key.py

@@ -38,9 +38,7 @@ class APIKey(Base):
     )  # Optional name ("Production Key", etc.)
     is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False, index=True)
     last_used_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
-    created_at: Mapped[datetime] = mapped_column(
-        DateTime, default=lambda: datetime.now(UTC)
-    )
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.now(UTC))
     expires_at: Mapped[datetime | None] = mapped_column(
         DateTime, nullable=True
     )  # None = no expiration