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/PdfFileAggregateResult.schema.ts

@@ -0,0 +1,29 @@
+import * as z from 'zod';
+export const PdfFileAggregateResultSchema = z.object({  _count: z.object({
+    id: z.number(),
+    filename: z.number(),
+    pdfData: z.number(),
+    uploadedAt: z.number(),
+    groupId: z.number(),
+    group: z.number()
+  }).optional(),
+  _sum: z.object({
+    id: z.number().nullable(),
+    groupId: z.number().nullable()
+  }).nullable().optional(),
+  _avg: z.object({
+    id: z.number().nullable(),
+    groupId: z.number().nullable()
+  }).nullable().optional(),
+  _min: z.object({
+    id: z.number().int().nullable(),
+    filename: z.string().nullable(),
+    uploadedAt: z.date().nullable(),
+    groupId: z.number().int().nullable()
+  }).nullable().optional(),
+  _max: z.object({
+    id: z.number().int().nullable(),
+    filename: z.string().nullable(),
+    uploadedAt: z.date().nullable(),
+    groupId: z.number().int().nullable()
+  }).nullable().optional()});