feat: add BullMQ queue infrastructure and frontend job status hook

- apps/Backend/src/queue/: connection, queues, workers, processors
- apps/Frontend/src/hooks/use-job-status.ts: WebSocket job progress hook
- apps/Frontend/src/lib/socket.ts: shared Socket.IO singleton

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

apps/Backend/src/queue/queues.ts

@@ -0,0 +1,48 @@
+import { Queue } from "bullmq";
+import { redisConnection } from "./connection";
+
+/** Job types dispatched to the selenium Python worker. */
+export type SeleniumJobType =
+  | "eligibility-check"
+  | "claim-status-check"
+  | "claim-submit"
+  | "claim-pre-auth";
+
+export interface SeleniumJobData {
+  jobType: SeleniumJobType;
+  userId: number;
+  socketId?: string;
+  /** Fully-enriched payload sent to the Python service. */
+  enrichedPayload: any;
+  /** Extra fields used for DB post-processing */
+  insuranceId?: string;
+  formFirstName?: string;
+  formLastName?: string;
+  formDob?: string;
+  claimId?: number;
+  /** Base64-encoded files for claim submit */
+  files?: { originalname: string; bufferBase64: string; mimetype: string }[];
+}
+
+export interface OcrJobData {
+  userId: number;
+  socketId?: string;
+  files: { originalname: string; bufferBase64: string; mimetype: string }[];
+}
+
+const defaultOpts = {
+  removeOnComplete: { count: 100 },
+  removeOnFail: { count: 50 },
+  attempts: 2,
+  backoff: { type: "exponential" as const, delay: 5000 },
+};
+
+export const seleniumQueue = new Queue<SeleniumJobData>("selenium-jobs", {
+  connection: redisConnection,
+  defaultJobOptions: defaultOpts,
+});
+
+export const ocrQueue = new Queue<OcrJobData>("ocr-jobs", {
+  connection: redisConnection,
+  defaultJobOptions: { ...defaultOpts, attempts: 2 },
+});