feat(books): add read-aloud generation

Generate a synced read-aloud EPUB from a book's EPUB and audiobook through an
optional STAlign worker (Docker on CPU, or native with MLX on Apple Silicon),
with review, re-sync, replace in place, restart recovery and live progress on
the Files tab. Book details also stack the ebook and audiobook covers when
both exist. See docs/READ_ALOUD.md.

workers/read-aloud/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "@bookorbit/read-aloud-worker",
+  "version": "0.0.1",
+  "private": true,
+  "license": "AGPL-3.0-only",
+  "type": "module",
+  "files": [
+    "dist",
+    "assets"
+  ],
+  "engines": {
+    "node": ">=24"
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "start": "node dist/main.js",
+    "pretest": "pnpm --filter @bookorbit/types build",
+    "test": "pnpm build && node --test test/*.test.mjs",
+    "pretype-check": "pnpm --filter @bookorbit/types build",
+    "type-check": "tsc --noEmit -p tsconfig.json"
+  },
+  "dependencies": {
+    "@bookorbit/types": "workspace:*",
+    "@storyteller-platform/align": "0.2.13",
+    "@storyteller-platform/ghost-story": "0.3.4",
+    "onnxruntime-node": "1.30.0",
+    "pino": "^10.3.1"
+  },
+  "devDependencies": {
+    "@types/node": "^26.6.3",
+    "typescript": "^6.0.3"
+  }
+}