feat: add Selenium Settings page to configure paymentGroupId per office

Adds a new Settings → Advanced → Selenium Settings page where the office
name (paymentGroupId) used in United/DentalHub portal dropdowns can be
configured without touching code. Previously hardcoded as "Summit Dental
Care"; now injected from DB into the three United workers at job dispatch.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/db/shared/schemas/variants/input/BackupDestination.input.ts

@@ -0,0 +1,12 @@
+import * as z from 'zod';
+// prettier-ignore
+export const BackupDestinationInputSchema = z.object({
+    id: z.number().int(),
+    userId: z.number().int(),
+    path: z.string(),
+    isActive: z.boolean(),
+    createdAt: z.date(),
+    user: z.unknown()
+}).strict();
+
+export type BackupDestinationInputType = z.infer<typeof BackupDestinationInputSchema>;