FRE-4473: Add VoicePrint job workers and Python ML service

- packages/jobs/: BullMQ-based async job queue for audio analysis
  with concurrency control and retry logic
- services/voiceprint-ml/: FastAPI microservice for ECAPA-TDNN
  inference with mock model, preprocessing, embedding extraction,
  and synthetic voice detection endpoints
- Includes Dockerfile and requirements.txt for ML service

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/jobs/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "@shieldsai/jobs",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "scripts": {
+    "start": "tsx src/index.ts",
+    "dev": "tsx watch src/index.ts"
+  },
+  "dependencies": {
+    "@shieldsai/shared-db": "*",
+    "@shieldsai/shared-utils": "*",
+    "bullmq": "^5.1.0",
+    "ioredis": "^5.3.0",
+    "zod": "^4.3.6"
+  },
+  "devDependencies": {
+    "tsx": "^4.7.1",
+    "typescript": "^5.3.3"
+  }
+}