add a retranslate chinese function

sentence_api/models.py

@@ -144,6 +144,31 @@ class SubtitleTranslationResponse(BaseModel):
     error: Optional[str] = None
 
 
+class TranslationTerm(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    source: str = Field(min_length=1, max_length=120)
+    zh: str = Field(min_length=1, max_length=120)
+
+    @field_validator("source", "zh")
+    @classmethod
+    def strip_term(cls, value: str) -> str:
+        cleaned = value.strip()
+        if not cleaned:
+            raise ValueError("translation term cannot be empty")
+        return cleaned
+
+
+class SubtitleRetranslateRequest(BaseModel):
+    model_config = ConfigDict(extra="forbid")
+
+    terms: List[TranslationTerm] = Field(default_factory=list, max_length=50)
+
+
+class AdminSubtitleTranslationResponse(SubtitleTranslationResponse):
+    terms: List[TranslationTerm] = Field(default_factory=list)
+
+
 class SentenceBoundaryAdjust(BaseModel):
     model_config = ConfigDict(extra="forbid")