feat: добавить генерацию image variants

- добавлен shared config presets, custom transforms и allowlist hosts
- реализованы Backend endpoints для assets, presets и variants
- добавлена orchestration через PostgreSQL, RabbitMQ, S3 и worker
- обновлён Gateway read-through flow с L1 cache и корректным Vary: Accept
- добавлена миграция resize_mode для variants lookup
- обновлены dev scripts, env template, lockfile и документация

apps/backend/package.json

@@ -4,15 +4,21 @@
   "private": true,
   "scripts": {
     "build": "nest build",
-    "dev": "nest start --watch",
-    "start": "node dist/main.js",
+    "dev": "node --env-file-if-exists=../../.env ./node_modules/@nestjs/cli/bin/nest.js start --watch",
+    "start": "node --env-file-if-exists=../../.env dist/main.js",
     "typecheck": "tsc --noEmit -p tsconfig.json"
   },
   "dependencies": {
+    "@image-platform/database": "workspace:*",
+    "@image-platform/image-config": "workspace:*",
+    "@image-platform/queue": "workspace:*",
+    "@image-platform/storage": "workspace:*",
     "@nestjs/common": "^11.0.0",
     "@nestjs/core": "^11.0.0",
     "@nestjs/platform-express": "^11.0.0",
     "@nestjs/swagger": "^11.0.0",
+    "amqplib": "^1.0.4",
+    "drizzle-orm": "^0.45.2",
     "reflect-metadata": "^0.2.2",
     "rxjs": "^7.8.1",
     "swagger-ui-express": "^5.0.1"
@@ -20,6 +26,8 @@
   "devDependencies": {
     "@nestjs/cli": "^11.0.0",
     "@nestjs/schematics": "^11.0.0",
+    "@types/amqplib": "^0.10.8",
+    "@types/express": "^5.0.6",
     "@types/node": "^24.0.0",
     "@types/swagger-ui-express": "^4.1.8",
     "typescript": "^5.9.0"