refactor: move zod import from validation package to zod (#2111)

* refactor: move zod import from validation package to zod

* refactor: move missing zod imports

packages/api/src/router/widgets/app.ts

@@ -1,8 +1,8 @@
 import { observable } from "@trpc/server/observable";
+import { z } from "zod";
 
 import { sendPingRequestAsync } from "@homarr/ping";
 import { pingChannel, pingUrlChannel } from "@homarr/redis";
-import { z } from "@homarr/validation";
 
 import { createTRPCRouter, publicProcedure } from "../../trpc";