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/src/internal-images/internal-images.controller.ts

@@ -0,0 +1,19 @@
+import { Body, Controller, NotImplementedException, Post } from "@nestjs/common"
+import { ApiOperation, ApiResponse, ApiTags } from "@nestjs/swagger"
+
+import { EnsureImageVariantRequestDto } from "./ensure-image-variant.dto"
+
+@ApiTags("internal-images")
+@Controller("internal/images")
+export class InternalImagesController {
+  @Post("ensure")
+  @ApiOperation({ summary: "Ensure image variant for Gateway L1 miss" })
+  @ApiResponse({ status: 501, description: "Read-through image pipeline is not implemented yet" })
+  ensureImageVariant(@Body() request: EnsureImageVariantRequestDto): never {
+    throw new NotImplementedException({
+      message: "image read-through pipeline is not implemented yet",
+      request,
+      status: "not_implemented",
+    })
+  }
+}