Add engine abstraction

src/vector_search_mcp/models.py

@@ -6,4 +6,22 @@ from pydantic import BaseModel
 class SearchRow(BaseModel):
     chunk_id: str
     score: float
-    payload: dict[str, Any]
+    payload: dict[str, Any]  # type: ignore[reportExplicitAny]
+
+
+class Condition(BaseModel): ...
+
+
+class Match(Condition):
+    key: str
+    value: str
+
+
+class MatchAny(Condition):
+    key: str
+    any: list[str]
+
+
+class MatchExclude(Condition):
+    key: str
+    exclude: list[str]