fix(api): 修復 ruff lint 錯誤

- langfuse_client.py: import Callable from collections.abc
- telemetry.py: import block 格式化

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/core/telemetry.py

@@ -291,7 +291,9 @@ def restore_trace_context(trace_context: dict[str, str] | None):
     from contextlib import contextmanager
 
     from opentelemetry.trace import SpanKind
-    from opentelemetry.trace.propagation.tracecontext import TraceContextTextMapPropagator
+    from opentelemetry.trace.propagation.tracecontext import (
+        TraceContextTextMapPropagator,
+    )
 
     tracer = get_tracer("awoooi.worker")