feat: добавить базовые сервисы image-platform

- добавлены backend, admin, gateway и worker skeleton
- добавлены Drizzle schema, database package и initial migration
- добавлены shared packages для RabbitMQ topology и S3 helpers
- обновлены dev-инфраструктура, env example, scripts и dependencies
- обновлена документация под versioned image URLs и read-through flow

apps/backend/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "@image-platform/backend",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "build": "nest build",
+    "dev": "nest start --watch",
+    "start": "node dist/main.js",
+    "typecheck": "tsc --noEmit -p tsconfig.json"
+  },
+  "dependencies": {
+    "@nestjs/common": "^11.0.0",
+    "@nestjs/core": "^11.0.0",
+    "@nestjs/platform-express": "^11.0.0",
+    "@nestjs/swagger": "^11.0.0",
+    "reflect-metadata": "^0.2.2",
+    "rxjs": "^7.8.1",
+    "swagger-ui-express": "^5.0.1"
+  },
+  "devDependencies": {
+    "@nestjs/cli": "^11.0.0",
+    "@nestjs/schematics": "^11.0.0",
+    "@types/node": "^24.0.0",
+    "@types/swagger-ui-express": "^4.1.8",
+    "typescript": "^5.9.0"
+  }
+}