fix: bf16 text encoder patch + trigger A10G rebuild

app.py

@@ -70,6 +70,20 @@ print("[2/4] Models ready.")
 # "./wan_models/Wan2.1-T2V-1.3B/..." so CWD must be the repo root.
 os.chdir(REPO_DIR)
 print(f"[3/4] CWD → {REPO_DIR}")
+
+# Patch wan_wrapper.py: change text encoder from float32 → bfloat16
+# This halves CPU RAM usage for the UMT5-XXL encoder (~10GB → ~5GB)
+_ww_path = os.path.join(REPO_DIR, "utils", "wan_wrapper.py")
+with open(_ww_path, "r") as _f:
+    _ww_src = _f.read()
+_ww_patched = _ww_src.replace(
+    "dtype=torch.float32,\n            device=torch.device('cpu')",
+    "dtype=torch.bfloat16,\n            device=torch.device('cpu')",
+)
+with open(_ww_path, "w") as _f:
+    _f.write(_ww_patched)
+print("[3/4] Patched wan_wrapper.py: text encoder dtype float32 → bfloat16")
+
 print("[3/4] Loading AvatarForcing pipeline...")
 device = torch.device("cuda" if torch.cuda.is_available() else "cpu")