feat: wire Tufts SCO to DentaQuest portal and fix insurance credential dropdown

- Add /dentaquest-eligibility endpoint in Python agent (Tufts SCO uses providers.dentaquest.com)
- Add backend route, processor, and service client for Tufts SCO (separate from UnitedSCO/DentalHub)
- Fix Tufts SCO button to post to new tuftssco route instead of unitedsco
- Fix credential field names: dentaquestUsername/Password (was tuftsscoUsername/Password)
- Fix socket event: listen for selenium:dentaquest_session_started (was unitedsco)
- Fix error visibility: keep session alive 30s on error so backend reads real message
- Replace free-text Site Key field with dropdown to prevent key mismatches

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

apps/Backend/src/queue/jobRunner.ts

@@ -14,6 +14,7 @@ import { runOcrProcessor } from "./processors/ocrProcessor";
 import { runDdmaEligibilityProcessor } from "./processors/ddmaEligibilityProcessor";
 import { runDeltaInsEligibilityProcessor } from "./processors/deltaInsEligibilityProcessor";
 import { runUnitedSCOEligibilityProcessor } from "./processors/unitedSCOEligibilityProcessor";
+import { runDentaQuestEligibilityProcessor } from "./processors/dentaQuestEligibilityProcessor";
 import { runCCAEligibilityProcessor } from "./processors/ccaEligibilityProcessor";
 import type { SeleniumJobData, OcrJobData } from "./queues";
 
@@ -114,6 +115,20 @@ export function enqueueSeleniumJob(data: SeleniumJobData): string {
         job.id
       );
     }
+    if (jobType === "tuftssco-eligibility-check") {
+      return runDentaQuestEligibilityProcessor(
+        {
+          enrichedPayload: data.enrichedPayload,
+          userId: data.userId,
+          insuranceId: data.insuranceId!,
+          formFirstName: data.formFirstName,
+          formLastName: data.formLastName,
+          formDob: data.formDob,
+          socketId: data.socketId,
+        },
+        job.id
+      );
+    }
     if (jobType === "cca-eligibility-check") {
       return runCCAEligibilityProcessor(
         {