refactor(structure): move legacy import and remove lib leftovers

src/schemas/import.schema.ts

@@ -0,0 +1,12 @@
+import { z } from "zod"
+
+const ACCEPTED_MIME_TYPES = ["text/csv", "text/comma-separated-values"]
+
+export const importSchema = z.object({
+  file: z.file().refine((file) => ACCEPTED_MIME_TYPES.includes(file.type), {
+    error: "File must be a CSV",
+  }),
+  categoryId: z.string().optional(),
+})
+
+export type ImportFormType = z.infer<typeof importSchema>