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/worker/src/config.ts

@@ -0,0 +1,25 @@
+import { loadQueueTopologyFromEnv, type QueueTopology } from "@image-platform/queue"
+
+export type WorkerConfig = {
+  prefetch: number
+  queueTopology: QueueTopology
+  rabbitmqUrl: string
+}
+
+export function loadWorkerConfig(env: NodeJS.ProcessEnv = process.env): WorkerConfig {
+  return {
+    prefetch: parsePositiveInteger(env.WORKER_PREFETCH, 2),
+    queueTopology: loadQueueTopologyFromEnv(env),
+    rabbitmqUrl: env.RABBITMQ_URL ?? "amqp://image:image-password@localhost:5672/image_platform",
+  }
+}
+
+function parsePositiveInteger(value: string | undefined, fallback: number) {
+  if (!value) {
+    return fallback
+  }
+
+  const parsed = Number.parseInt(value, 10)
+
+  return Number.isSafeInteger(parsed) && parsed > 0 ? parsed : fallback
+}