feat: add processor service with Redis-backed job queue

- Introduced a new `processor` service in the Docker Compose setup to handle face matching jobs.
- Configured Redis as a job queue and state management system for processing searches.
- Updated the backend to enqueue jobs and manage user locks using Redis.
- Added environment variables for Redis configuration and runtime paths.
- Created technical design documentation for the processor service outlining architecture, queue model, and search lifecycle.
- Updated package.json and package-lock.json to include dependencies for BullMQ and ioredis in the processor workspace.
- Added sample PKL files for local testing in the `test_pkl` directory.

faceai/apps/processor/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "@regalami/faceai-processor",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "node --watch src/worker.js",
+    "build": "node -e \"console.log('processor build not required')\"",
+    "start": "node src/worker.js"
+  },
+  "dependencies": {
+    "bullmq": "^5.48.1",
+    "ioredis": "^5.4.1"
+  }
+}