feat(api,web): add batch processing with ZIP download and SSE progress

Backend: POST /api/v1/tools/:toolId/batch accepts multiple files +
settings, processes via p-queue with CONCURRENT_JOBS concurrency limit,
streams ZIP response using archiver. Tool registry in tool-factory
enables batch to reuse any registered tool's process function. SSE
endpoint at GET /api/v1/jobs/:jobId/progress provides real-time updates.
Handles partial failures gracefully, preserves filenames, deduplicates
collisions. Frontend: use-batch-processor hook handles upload, SSE
progress tracking, and automatic ZIP download.

apps/api/package.json

@@ -11,26 +11,29 @@
     "clean": "rm -rf dist"
   },
   "dependencies": {
-    "@stirling-image/image-engine": "workspace:*",
-    "@stirling-image/shared": "workspace:*",
-    "sharp": "^0.33.0",
-    "fastify": "^5.2.0",
-    "@fastify/static": "^8.1.0",
-    "@fastify/multipart": "^9.0.0",
     "@fastify/cors": "^11.0.0",
+    "@fastify/multipart": "^9.0.0",
     "@fastify/rate-limit": "^10.2.0",
+    "@fastify/static": "^8.1.0",
     "@fastify/swagger": "^9.4.0",
     "@fastify/swagger-ui": "^5.2.0",
+    "@stirling-image/image-engine": "workspace:*",
+    "@stirling-image/shared": "workspace:*",
+    "archiver": "^7.0.1",
+    "better-sqlite3": "^11.7.0",
     "dotenv": "^16.4.0",
-    "zod": "^3.24.0",
     "drizzle-orm": "^0.38.0",
-    "better-sqlite3": "^11.7.0"
+    "fastify": "^5.2.0",
+    "p-queue": "^9.1.0",
+    "sharp": "^0.33.0",
+    "zod": "^3.24.0"
   },
   "devDependencies": {
-    "typescript": "^5.7.0",
-    "tsx": "^4.19.0",
+    "@types/archiver": "^7.0.0",
+    "@types/better-sqlite3": "^7.6.0",
     "@types/node": "^22.0.0",
     "drizzle-kit": "^0.30.0",
-    "@types/better-sqlite3": "^7.6.0"
+    "tsx": "^4.19.0",
+    "typescript": "^5.7.0"
   }
 }