feat(i18n): add Thai (th-TH) language support

Frontend:
- Add frontend/src/i18n/th-TH.json (913 keys, full parity with zh-CN)
- Register th-TH in i18n entry with native element-plus-secondary Thai locale
- Add Thai option to language selectors, legacy th_TH alias mapping,
  and browser locale detection (th* -> th-TH)
- Add common.thai label to all existing locale files

Backend:
- Add backend/locales/th-TH.json (177 keys)
- Accept th-TH in language whitelist, schema regex, and MCP question
- Map th* to Thai language name in LLM prompt language selection
- Apply question language to guess-question prompt template

Author: ulleo

backend/apps/chat/models/chat_model.py

@@ -354,7 +354,7 @@ def guess_sys_question(self, articles_number: int = 4):
                                                               sqlbot_name=self.sqlbot_name)
 
     def guess_user_question(self, old_questions: str = "[]"):
-        return get_guess_question_template()['user'].format(question=self.question, schema=self.db_schema,
+        return get_guess_question_template()['user'].format(lang=self.lang, question=self.question, schema=self.db_schema,
                                                             old_questions=old_questions)
 
     def filter_sys_question(self):
@@ -411,7 +411,7 @@ class ChatQuestionBase(BaseModel):
 class McpQuestion(ChatQuestionBase):
     token: str = Body(description='token')
     stream: Optional[bool] = Body(description='是否流式输出，默认为true开启, 关闭false则返回JSON对象', default=True)
-    lang: Optional[str] = Body(description='语言：zh-CN|zh-TW|en|ko-KR', default='zh-CN')
+    lang: Optional[str] = Body(description='语言：zh-CN|zh-TW|en|ko-KR|th-TH', default='zh-CN')
     datasource_id: Optional[int | str] = Body(description='数据源ID，仅当当前对话没有确定数据源时有效', default=None)
     return_img: Optional[bool] = Body(description='是否返回图表，默认为true开启, 关闭false则仅返回数据', default=True)
     custom_model: Optional[str | int] = Body(description='模型ID', default=None)

backend/apps/chat/task/llm.py

@@ -2086,6 +2086,8 @@ def get_lang_name(lang: str):
         return '英文'
     if normalized.startswith('ko'):
         return '韩语'
+    if normalized.startswith('th'):
+        return '泰语'
     return '简体中文'
 
 

backend/apps/mcp/mcp.py

@@ -166,7 +166,7 @@ async def get_model_by_ws(session: SessionDep, mcp_oid: WsMcp):
 async def mcp_question(session: SessionDep, trans: Trans, chat: McpQuestion):
     session_user = get_user(session, chat.token)
     lang = chat.lang
-    if lang in ["zh-CN", "zh-TW", "en", "ko-KR"]:
+    if lang in ["zh-CN", "zh-TW", "en", "ko-KR", "th-TH"]:
         session_user.language = lang
     # if chat.oid:
     #     w_list = await user_ws_options(session, session_user.id, trans)

backend/apps/system/api/user.py

@@ -370,7 +370,7 @@ async def batch_del(session: SessionDep, id_list: list[int]):
 @clear_cache(namespace=CacheNamespace.AUTH_INFO, cacheName=CacheName.USER_INFO, keyExpression="current_user.id")
 async def langChange(session: SessionDep, current_user: CurrentUser, trans: Trans, language: UserLanguage):
     lang = language.language
-    if lang not in ["zh-CN", "zh-TW", "en", "ko-KR"]:
+    if lang not in ["zh-CN", "zh-TW", "en", "ko-KR", "th-TH"]:
         raise Exception(trans('i18n_user.language_not_support', key = lang))
     db_user: UserModel = get_db_user(session=session, user_id=current_user.id)
     db_user.language = lang

backend/apps/system/schemas/system_schema.py

@@ -32,7 +32,7 @@ class BaseUser(BaseModel):
 
 
 class BaseUserDTO(BaseUser, BaseCreatorDTO):
-    language: str = Field(pattern=r"^(zh-CN|zh-TW|en|ko-KR)$", default="zh-CN", description="用户语言")
+    language: str = Field(pattern=r"^(zh-CN|zh-TW|en|ko-KR|th-TH)$", default="zh-CN", description="用户语言")
     password: str
     status: int = 1
     origin: int = 0
@@ -47,8 +47,8 @@ def to_dict(self):
 
     @field_validator("language")
     def validate_language(cls, lang: str) -> str:
-        if not re.fullmatch(r"^(zh-CN|zh-TW|en|ko-KR)$", lang):
-            raise ValueError("Language must be 'zh-CN', 'zh-TW', 'en', or 'ko-KR'")
+        if not re.fullmatch(r"^(zh-CN|zh-TW|en|ko-KR|th-TH)$", lang):
+            raise ValueError("Language must be 'zh-CN', 'zh-TW', 'en', 'ko-KR', or 'th-TH'")
         return lang
 
 

backend/locales/th-TH.json

@@ -564,8 +564,6 @@ template:
 
   guess:
     system: |
-      ### 请使用语言：{lang} 回答，不需要输出深度思考过程
-      
       ### 说明：
       您的任务是根据给定的表结构，用户问题以及以往用户提问，推测用户接下来可能提问的1-{articles_number}个问题。
       请遵循以下规则：
@@ -581,7 +579,6 @@ template:
       - 最多返回{articles_number}个你推测出的结果
       - 若无法推测,则返回空数据JSON:
       []
-      - 若你的给出的JSON不是{lang}的，则必须翻译为{lang}
       
       ### 响应, 请直接返回JSON结果（不要包含任何其他文本）：
 
@@ -595,7 +592,8 @@ template:
       ### 以往提问:
       {old_questions}
       
-      /no_think
+      ## 请根据上述要求，使用语言：{lang} 进行输出，不需要输出深度思考过程
+      ## JSON列表内的值，语言请与 {lang} 保持一致
   analysis:
     system: |
       <Instruction>

backend/templates/template.yaml

@@ -36,6 +36,7 @@ const languageOptions = computed(() => [
   { value: 'zh-CN', label: t('common.simplified_chinese') },
   { value: 'zh-TW', label: t('common.traditional_chinese') },
   { value: 'ko-KR', label: t('common.korean') },
+  { value: 'th-TH', label: t('common.thai') },
 ])
 
 const selectedLanguage = computed(() => {

frontend/src/components/Language-selector/index.vue

@@ -66,6 +66,10 @@ const languageList = computed(() => [
     name: '한국인',
     value: 'ko-KR',
   },
+  {
+    name: 'ไทย',
+    value: 'th-TH',
+  },
 ])
 const popoverRef = ref()
 

frontend/src/components/layout/Person.vue

@@ -209,6 +209,7 @@
     "reset": "Reset",
     "simplified_chinese": "简体中文",
     "korean": "한국어",
+    "thai": "ไทย",
     "traditional_chinese": "繁體中文",
     "help": "Help",
     "language": "Language",