[Misc] Remove Dynin-Omni and dots.tts support (#7655)

Signed-off-by: wangyu <410167048@qq.com>
Signed-off-by: Yueqian Lin <linyueqian@outlook.com>
Co-authored-by: Yueqian Lin <linyueqian@outlook.com>

vllm_omni/diffusion/model_loader/hub_prefetch.py

@@ -30,8 +30,7 @@ Two environmental factors mask the race on main:
   ``cached_files`` (plural) which batch-resolves every shard listed in the
   index up-front via ``os.path.isfile`` and raises immediately if any shard
   is still sitting under its ``*.incomplete`` name. Same wave of v5 changes
-  that introduced ``tie_weights(missing_keys=..., recompute_mapping=...)``
-  (see the Dynin shim in ``dynin_omni_token2text.py``).
+  that introduced ``tie_weights(missing_keys=..., recompute_mapping=...)``.
 * CI shares ``HF_HOME=/fsx/hf_cache`` across pipelines (both the
   ``vllm-omni`` and ``vllm-omni-rebase`` pipelines mount the same FS). That
   cache is normally warm for long-lived repos like ``Qwen-Image-Edit-2509``,
@@ -195,19 +194,22 @@ def _repo_prefetch_lock(model: str) -> Iterator[None]:
     flock_held = False
 
     # --- fcntl.flock path ---
+    fcntl_mod: Any = None
     try:
-        import fcntl  # type: ignore[import-not-found]
-    except ImportError:  # pragma: no cover - non-POSIX (Windows)
-        fcntl = None
+        import fcntl as _fcntl
 
-    if fcntl is not None:
+        fcntl_mod = _fcntl
+    except ImportError:  # pragma: no cover - non-POSIX (Windows)
+        pass
+
+    if fcntl_mod is not None:
         try:
             lock_dir = _node_lock_dir()
         except OSError as exc:
             logger.warning("Could not allocate lock dir for prefetch of %s (%s); skipping flock", model, exc)
-            fcntl = None  # force dotfile fallback
+            fcntl_mod = None  # force dotfile fallback
 
-    if fcntl is not None and lock_dir is not None:
+    if fcntl_mod is not None and lock_dir is not None:
         lock_path = os.path.join(lock_dir, _safe_repo_filename(model))
         try:
             fd = os.open(lock_path, os.O_RDWR | os.O_CREAT, 0o644)
@@ -217,7 +219,7 @@ def _repo_prefetch_lock(model: str) -> Iterator[None]:
 
         if fd is not None:
             try:
-                fcntl.flock(fd, fcntl.LOCK_EX)
+                fcntl_mod.flock(fd, fcntl_mod.LOCK_EX)
                 flock_held = True
                 logger.info("Acquired flock prefetch lock for %s at %s", model, lock_path)
             except OSError as exc:
@@ -249,9 +251,9 @@ def _repo_prefetch_lock(model: str) -> Iterator[None]:
     try:
         yield
     finally:
-        if flock_held and fd is not None:
+        if flock_held and fd is not None and fcntl_mod is not None:
             with contextlib.suppress(OSError):
-                fcntl.flock(fd, fcntl.LOCK_UN)
+                fcntl_mod.flock(fd, fcntl_mod.LOCK_UN)
         if fd is not None:
             with contextlib.suppress(OSError):
                 os.close(fd)