feat: paginated commands endpoint for attacker profiles

New GET /attackers/{uuid}/commands?limit=&offset=&service= endpoint
serves commands with server-side pagination and optional service filter.
AttackerDetail frontend fetches commands from this endpoint with
page controls. Service badge filter now drives both the API query
and the local fingerprint filter.

decnet/web/db/repository.py

@@ -142,3 +142,14 @@ class BaseRepository(ABC):
     async def get_total_attackers(self, search: Optional[str] = None, service: Optional[str] = None) -> int:
         """Retrieve the total count of attacker profile records, optionally filtered."""
         pass
+
+    @abstractmethod
+    async def get_attacker_commands(
+        self,
+        uuid: str,
+        limit: int = 50,
+        offset: int = 0,
+        service: Optional[str] = None,
+    ) -> dict[str, Any]:
+        """Retrieve paginated commands for an attacker, optionally filtered by service."""
+        pass