fix(chat): honor ui_lang on WebSocket turns; ops NE display by host_name

Resolve runtime language from ui_lang and chat.send lang instead of hardcoding zh.
Align generalist/ops prompts with user language and require host_name (not ne_id) in ops outputs.

Co-authored-by: Cursor <cursoragent@cursor.com>

runtime/lang.py

@@ -0,0 +1,21 @@
+from __future__ import annotations
+
+from typing import Any
+
+
+def resolve_runtime_lang(*, store: Any | None = None, hint: str | None = None) -> str:
+    """Resolve zh/en for agent runtime (WS, worker, HTTP share this helper)."""
+    raw = str(hint or "").strip().lower()
+    if raw in ("zh", "en"):
+        return raw
+    if store is not None:
+        try:
+            v = str(store.get_setting("ui_lang") or "zh").strip().lower()
+        except Exception:
+            v = "zh"
+        if v in ("zh", "en"):
+            return v
+    return "zh"
+
+
+__all__ = ["resolve_runtime_lang"]