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/main.ts

@@ -0,0 +1,37 @@
+import { NestFactory } from "@nestjs/core"
+import { DocumentBuilder, SwaggerModule } from "@nestjs/swagger"
+
+import { AppModule } from "./app.module"
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule)
+
+  app.setGlobalPrefix("api")
+  app.enableShutdownHooks()
+
+  const openApiConfig = new DocumentBuilder()
+    .setTitle("Image Platform API")
+    .setDescription("Control plane for image assets, variants, S3 storage and external imgproxy.")
+    .setVersion("0.1.0")
+    .addTag("system")
+    .addTag("assets")
+    .addTag("variants")
+    .addTag("allowed-hosts")
+    .addTag("internal-images")
+    .build()
+
+  const openApiDocument = SwaggerModule.createDocument(app, openApiConfig)
+
+  SwaggerModule.setup("docs", app, openApiDocument, {
+    jsonDocumentUrl: "docs-json",
+    swaggerOptions: {
+      persistAuthorization: true,
+    },
+  })
+
+  const port = Number.parseInt(process.env.API_PORT ?? "3001", 10)
+
+  await app.listen(port)
+}
+
+void bootstrap()