feat: add language selector for voice_design + Chinese instruct support

- Generate: language dropdown (auto/English/Chinese), passed only in
  voice_design and auto_voice modes where it selects the instruct vocab
- VoiceDesign: Chinese mode with dialect/age/pitch/gender dropdowns
  using the model's validated Chinese instruct vocabulary (全角逗号)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nodes/voice_design.py

@@ -11,7 +11,7 @@ class OmniVoiceVoiceDesign:
         "high pitch", "very high pitch", "whisper",
     ]
 
-    # Exactly the accents validated by the model's _resolve_instruct()
+    # Exactly the accents validated by the model's _resolve_instruct() for English
     ACCENTS = [
         "none",
         "american accent", "australian accent", "british accent",
@@ -20,18 +20,42 @@ class OmniVoiceVoiceDesign:
         "russian accent",
     ]
 
+    # Chinese dialect items validated by the model's _resolve_instruct()
+    ZH_GENDERS  = ["none", "男", "女"]
+    ZH_AGES     = ["none", "儿童", "少年", "青年", "中年", "老年"]
+    ZH_PITCHES  = ["none", "极低音调", "低音调", "中音调", "高音调", "极高音调", "耳语"]
+    ZH_DIALECTS = [
+        "none",
+        "东北话", "云南话", "四川话", "宁夏话", "桂林话",
+        "河南话", "济南话", "甘肃话", "石家庄话", "贵州话",
+        "陕西话", "青岛话",
+    ]
+
     @classmethod
     def INPUT_TYPES(cls):
         return {
             "required": {
+                "language": (
+                    ["English", "Chinese"],
+                    {
+                        "default": "English",
+                        "tooltip": "Selects the instruct vocabulary. Must match the language set in OmniVoice Generate.",
+                    },
+                ),
                 "gender": (cls.GENDERS, {"default": "female",
-                    "tooltip": "Voice gender."}),
+                    "tooltip": "Voice gender (English). Ignored when language is Chinese — use zh_gender."}),
                 "age":    (cls.AGES,    {"default": "none",
-                    "tooltip": "Approximate age of the speaker."}),
+                    "tooltip": "Age of the speaker (English). Ignored when language is Chinese — use zh_age."}),
                 "pitch":  (cls.PITCHES, {"default": "none",
-                    "tooltip": "Pitch / register of the voice."}),
+                    "tooltip": "Pitch (English). Ignored when language is Chinese — use zh_pitch."}),
                 "accent": (cls.ACCENTS, {"default": "none",
-                    "tooltip": "Accent validated by the model. Only these 10 are supported."}),
+                    "tooltip": "Accent (English only, 10 supported values)."}),
+            },
+            "optional": {
+                "zh_gender":  (cls.ZH_GENDERS,  {"default": "none", "tooltip": "声线性别 (Chinese mode)"}),
+                "zh_age":     (cls.ZH_AGES,      {"default": "none", "tooltip": "年龄段 (Chinese mode)"}),
+                "zh_pitch":   (cls.ZH_PITCHES,   {"default": "none", "tooltip": "音调 (Chinese mode)"}),
+                "zh_dialect": (cls.ZH_DIALECTS,  {"default": "none", "tooltip": "方言/口音 (Chinese mode)"}),
             },
         }
 
@@ -40,6 +64,11 @@ class OmniVoiceVoiceDesign:
     FUNCTION      = "compose"
     CATEGORY      = "OmniVoice"
 
-    def compose(self, gender, age, pitch, accent):
-        parts = [v for v in [gender, age, pitch, accent] if v != "none"]
-        return (", ".join(parts),)
+    def compose(self, language, gender, age, pitch, accent,
+                zh_gender="none", zh_age="none", zh_pitch="none", zh_dialect="none"):
+        if language == "Chinese":
+            parts = [v for v in [zh_gender, zh_age, zh_pitch, zh_dialect] if v != "none"]
+            return ("，".join(parts),)
+        else:
+            parts = [v for v in [gender, age, pitch, accent] if v != "none"]
+            return (", ".join(parts),)