Add paginated users/roles, user status, frontend permissions, profile pictures, identifier file storage

- Users page: paginated, searchable, sortable with inline roles (no N+1)
- Roles page: paginated, searchable, sortable + /roles/all for dropdowns
- User is_active field with migration, PATCH toggle, auth check (disabled=401)
- Frontend permission checks: auth store loads permissions, sidebar/buttons conditional
- Profile pictures via file storage for users and members, avatar component
- Identifier images use file storage API instead of base64
- Fix TypeScript errors across admin UI
- 64 API tests passing (10 new)

packages/shared/src/schemas/inventory.schema.ts

@@ -2,7 +2,7 @@ import { z } from 'zod'
 
 /** Coerce empty strings to undefined — solves HTML form inputs sending '' for blank optional fields */
 function opt<T extends z.ZodTypeAny>(schema: T) {
-  return z.preprocess((v) => (v === '' ? undefined : v), schema.optional()) as z.ZodEffects<z.ZodOptional<T>>
+  return z.preprocess((v) => (v === '' ? undefined : v), schema.optional())
 }
 
 export const CategoryCreateSchema = z.object({