feat: 新增代码

video_worker/app/model_router.py

@@ -0,0 +1,15 @@
+from app.backends.hunyuan_backend import HunyuanBackend
+from app.backends.ltx_backend import LTXBackend
+
+
+class ModelRouter:
+    def __init__(self, ltx_backend: LTXBackend, hunyuan_backend: HunyuanBackend):
+        self._ltx = ltx_backend
+        self._hunyuan = hunyuan_backend
+
+    def route(self, quality_mode: str):
+        if quality_mode == "preview":
+            return self._ltx
+        if quality_mode == "refine":
+            return self._hunyuan
+        raise ValueError(f"Unsupported quality_mode: {quality_mode}")