fix: Superforms SSR import from /server path and Prisma client version mismatch

- Import superValidate from sveltekit-superforms/server instead of default
  path to avoid pulling SuperDebug.svelte into SSR
- Upgrade @prisma/client to match prisma CLI version (7.2.0 -> 7.8.0)
  so generated client's query_compiler_fast_bg files exist at runtime
- Add regression test verifying superValidate works in server context
- Add regression test verifying generated Prisma client compiler imports
  reference real files

src/lib/svelte-admin/crud.ts

@@ -1,7 +1,7 @@
 import { getDelegate, parseId } from './prisma-delegate';
 import { extractFormData } from './form-data';
 import type { AdminModelConfig } from './types';
-import { superValidate } from 'sveltekit-superforms';
+import { superValidate } from 'sveltekit-superforms/server';
 import { zod4 } from 'sveltekit-superforms/adapters';
 import * as Schemas from './schemas';
 import type { z } from 'zod';