feat: asset rename + delete

server/graph/schemas/asset.graphql

@@ -35,6 +35,15 @@ type AssetMutation {
     slug: String!
     name: String
   ): DefaultResponse @auth(requires: ["manage:system", "write:assets"])
+
+  renameAsset(
+    id: Int!
+    filename: String!
+  ): DefaultResponse @auth(requires: ["manage:system", "manage:assets"])
+
+  deleteAsset(
+    id: Int!
+  ): DefaultResponse @auth(requires: ["manage:system", "manage:assets"])
 }
 
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