fix:更新隐私协议语言问题

server/app/api/v1/legal.py

@@ -90,13 +90,23 @@ def _resolve_lang(accept_language: Optional[str]) -> ResolvedLang:
 
     if not accept_language:
         return "en"
-    s = accept_language.lower()
 
-    # 目前只支持 EN / TC：只要是中文或显式 tc，都归到 tc
-    if "tc" in s:
+    # 按语言优先级顺序逐项解析，避免“只要包含 zh 就全判 tc”。
+    # 例如：en-US,en;q=0.9,zh-CN;q=0.8 应命中 en，而不是 tc。
+    items = [seg.strip().lower() for seg in accept_language.split(",") if seg.strip()]
+    for item in items:
+        lang_tag = item.split(";", 1)[0].strip()
+        if not lang_tag:
+            continue
+
+        if lang_tag == "tc":
             return "tc"
-    if "zh" in s or "hant" in s or "tw" in s or "hk" in s or "mo" in s:
+        if lang_tag.startswith(("zh-hant", "zh-tw", "zh-hk", "zh-mo")):
             return "tc"
+        if lang_tag.startswith("zh"):
+            return "tc"
+        if lang_tag.startswith("en"):
+            return "en"
 
     return "en"