misc: backend setup + create secret metadata

backend/src/services/resource-metadata/resource-metadata-schema.ts

@@ -0,0 +1,10 @@
+import z from "zod";
+
+export const ResourceMetadataSchema = z
+  .object({
+    key: z.string().trim().min(1),
+    value: z.string().trim().min(1)
+  })
+  .array();
+
+export type ResourceMetadataDTO = z.infer<typeof ResourceMetadataSchema>;