kin: KIN-INFRA-007 Рефакторинг: убрать дублирование VALID_RUNTIMES и перенести import'ы из функции

web/api.py

@@ -761,12 +761,10 @@ def patch_task(task_id: str, body: TaskPatch):
 
 @app.get("/api/pipelines/{pipeline_id}/logs")
 def get_pipeline_logs(pipeline_id: int, since_id: int = 0):
-    """Get pipeline log entries after since_id (for live console polling)."""
+    """Get pipeline log entries after since_id (for live console polling).
+    Returns [] if pipeline does not exist — consistent empty response for log collections.
+    """
     conn = get_conn()
-    row = conn.execute("SELECT id FROM pipelines WHERE id = ?", (pipeline_id,)).fetchone()
-    if not row:
-        conn.close()
-        raise HTTPException(404, f"Pipeline {pipeline_id} not found")
     logs = models.get_pipeline_logs(conn, pipeline_id, since_id=since_id)
     conn.close()
     return logs