fix: mirror manual furni uploads to live assets

src/lib/services/upload-import.ts

@@ -2,7 +2,7 @@ import { existsSync, promises as fs } from "node:fs";
 import path from "node:path";
 import { eq, sql } from "drizzle-orm";
 import { db, ItemsBase } from "@/lib/db";
-import { getFurniAssetDirs } from "@/lib/services/furni-asset-dirs";
+import { getFurniAssetWriteTargets } from "@/lib/services/furni-asset-dirs";
 import { appendFurniEntry, buildFurniEntry } from "@/lib/services/furni-data";
 import {
 	allocateCatalogItemId,
@@ -43,6 +43,36 @@ const MIGRATIONS_DIR = path.resolve(
 
 let itemsBaseIdAllocChain: Promise<unknown> = Promise.resolve();
 
+function pathKey(value: string): string {
+	const normalized = path.normalize(value);
+	return process.platform === "win32" ? normalized.toLowerCase() : normalized;
+}
+
+async function mirrorUploadedAsset(
+	sourcePath: string,
+	fileName: string,
+	dirs: string[],
+	warnings: string[],
+	copiedPaths: string[],
+): Promise<void> {
+	const sourceKey = pathKey(sourcePath);
+	const seen = new Set<string>();
+	for (const dir of dirs) {
+		const targetPath = path.join(/*turbopackIgnore: true*/ dir, fileName);
+		const targetKey = pathKey(targetPath);
+		if (targetKey === sourceKey || seen.has(targetKey)) continue;
+		seen.add(targetKey);
+		try {
+			await fs.copyFile(sourcePath, targetPath);
+			copiedPaths.push(targetPath);
+		} catch (err) {
+			warnings.push(
+				`asset mirror failed (${targetPath}): ${(err as Error).message}`,
+			);
+		}
+	}
+}
+
 async function allocateItemsBaseId<T>(
 	insertFn: (nextId: number) => Promise<T>,
 ): Promise<T> {
@@ -200,7 +230,8 @@ export async function uploadSingleFurni(params: {
 	}
 
 	await ensureDirectories();
-	const { iconDir, nitroDir } = await getFurniAssetDirs();
+	const assetTargets = await getFurniAssetWriteTargets();
+	const { iconDir, nitroDir } = assetTargets;
 
 	const nitroFileName = `${classname}.nitro`;
 	const nitroPath = path.join(
@@ -225,6 +256,24 @@ export async function uploadSingleFurni(params: {
 		await fs.writeFile(iconPath, iconBuffer);
 	}
 
+	const mirroredPaths: string[] = [];
+	await mirrorUploadedAsset(
+		nitroPath,
+		nitroFileName,
+		assetTargets.mirrorDirs.map((target) => target.nitroDir),
+		warnings,
+		mirroredPaths,
+	);
+	if (iconPath && iconFileName) {
+		await mirrorUploadedAsset(
+			iconPath,
+			iconFileName,
+			assetTargets.mirrorDirs.map((target) => target.iconDir),
+			warnings,
+			mirroredPaths,
+		);
+	}
+
 	const xdim = userXdim ?? Number(nitroMeta?.xdim ?? 1);
 	const ydim = userYdim ?? Number(nitroMeta?.ydim ?? 1);
 
@@ -248,6 +297,9 @@ export async function uploadSingleFurni(params: {
 	} catch (err) {
 		await fs.unlink(nitroPath).catch(() => {});
 		if (iconPath) await fs.unlink(iconPath).catch(() => {});
+		await Promise.all(
+			mirroredPaths.map((file) => fs.unlink(file).catch(() => {})),
+		);
 		return {
 			ok: false,
 			classname,