merge: integrate ZSY customer service and profile capabilities

app/core/knowledge_contracts.py

@@ -20,6 +20,8 @@ ALLOWED_COLLECTIONS = frozenset({
     "fin_product_collection",
     "fin_policy_collection",
 })
+# 兼容知识生命周期服务的历史命名；两者必须始终指向同一白名单。
+ALLOWED_KNOWLEDGE_COLLECTIONS = ALLOWED_COLLECTIONS
 
 #: text-embedding-v3 输出维度。维度不符必须失败关闭。
 VECTOR_DIM = 1024
@@ -80,6 +82,8 @@ class KnowledgeHit(BaseModel):
     collection: str
     title: str | None = None
     snippet: str
+    # MySQL 权威过滤后附加的完整答案；Milvus 原始命中可不携带该字段。
+    answer: str | None = None
     score: float | None = Field(default=None, ge=0, le=1)
     tags: tuple[str, ...] = ()
     version: str | None = None
@@ -99,7 +103,7 @@ class KnowledgeHit(BaseModel):
 class KnowledgeSearchResult(BaseModel):
     model_config = ConfigDict(extra="forbid", frozen=True)
 
-    hits: tuple[KnowledgeHit, ...]
+    hits: tuple[KnowledgeHit, ...] = ()
     degraded: bool = False
     degradation_reason: str | None = None
     searched_collections: tuple[str, ...] = ()