feat(req-002): implement portfolio tagging and tag filters

tests/test_domain_services.py

@@ -63,6 +63,9 @@ class FakeRepo:
         broker: str | None = None,
         status: str | None = None,
         owner_user_id: str | None = None,
+        include_tags: list[str] | None = None,
+        exclude_tags: list[str] | None = None,
+        match_mode: str | None = None,
     ) -> list[Portfolio]:
         if self._portfolio is None:
             return []
@@ -70,6 +73,15 @@ class FakeRepo:
             return []
         return [self._portfolio]
 
+    def add_tag(self, portfolio_id: str, *, tag: str):
+        raise NotImplementedError()
+
+    def list_tags(self, portfolio_id: str):
+        return []
+
+    def remove_tag(self, portfolio_id: str, *, tag: str) -> None:
+        raise NotImplementedError()
+
     def get_strategy_set(self, id: str) -> StrategySet | None:
         return self.strategy_set if id == self.strategy_set.id else None