feat(sync): implement lww conflict and tombstone handling

apps/api/src/main.ts

@@ -1,10 +1,18 @@
 import "reflect-metadata";
 import { ValidationPipe } from "@nestjs/common";
 import { NestFactory } from "@nestjs/core";
+import type { NestExpressApplication } from "@nestjs/platform-express";
 import { AppModule } from "./app.module";
 
 async function bootstrap(): Promise<void> {
-  const app = await NestFactory.create(AppModule);
+  const app = await NestFactory.create<NestExpressApplication>(AppModule);
+  const bodyLimit = process.env.API_BODY_LIMIT ?? "8mb";
+
+  app.useBodyParser("json", { limit: bodyLimit });
+  app.useBodyParser("urlencoded", {
+    extended: true,
+    limit: bodyLimit
+  });
   app.enableCors({
     origin: true,
     credentials: true

apps/api/src/sync/dto/sync-push.dto.ts

@@ -39,7 +39,7 @@ export class SyncPushOperationDto {
 
   @IsOptional()
   @IsString()
-  @MaxLength(50000)
+  @MaxLength(5000000)
   payload?: string;
 
   @Type(() => Number)