refactor: reorganize import statements and improve code formatting across multiple files

backend/tests/test_boards_delete.py

@@ -10,8 +10,8 @@ from uuid import uuid4
 
 import pytest
 
-from app.api import boards
 import app.services.board_lifecycle as board_lifecycle
+from app.api import boards
 from app.models.boards import Board
 from app.services.openclaw.gateway_rpc import OpenClawGatewayError
 

backend/tests/test_template_size_budget.py

@@ -18,6 +18,6 @@ def test_heartbeat_templates_fit_in_injected_context_limit() -> None:
     )
     for name in targets:
         size = (TEMPLATES_DIR / name).stat().st_size
-        assert size <= HEARTBEAT_CONTEXT_LIMIT, (
-            f"{name} is {size} chars (limit {HEARTBEAT_CONTEXT_LIMIT})"
-        )
+        assert (
+            size <= HEARTBEAT_CONTEXT_LIMIT
+        ), f"{name} is {size} chars (limit {HEARTBEAT_CONTEXT_LIMIT})"