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/results/CloudFileFindFirstResult.schema.ts

@@ -0,0 +1,17 @@
+import * as z from 'zod';
+export const CloudFileFindFirstResultSchema = z.nullable(z.object({
+  id: z.number().int(),
+  userId: z.number().int(),
+  name: z.string(),
+  mimeType: z.string().optional(),
+  fileSize: z.bigint(),
+  folderId: z.number().int().optional(),
+  isComplete: z.boolean(),
+  totalChunks: z.number().int().optional(),
+  diskPath: z.string().optional(),
+  createdAt: z.date(),
+  updatedAt: z.date(),
+  user: z.unknown(),
+  folder: z.unknown().optional(),
+  chunks: z.array(z.unknown())
+}));