create branch dev and commit code

src/routes/api/adv-upload/+server.ts

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+import { json, error } from '@sveltejs/kit';
+import type { RequestHandler } from './$types';
+import { env } from '$env/dynamic/public';
+
+// Adv videos are served by the same taobin_image service as menu images.
+const ADV_API_BASE = env.PUBLIC_POST_IMAGE;
+
+export const POST: RequestHandler = async ({ request }) => {
+	try {
+		const formData = await request.formData();
+
+		const country = formData.get('country') as string;
+		const uid = formData.get('uid') as string;
+		const displayName = formData.get('displayName') as string;
+		const email = formData.get('email') as string;
+		const file = formData.get('file') as File;
+		// 'false' when the manifest is generated on a machine (method 2).
+		const regenerate = (formData.get('regenerate') as string) ?? 'true';
+
+		if (!country || !uid || !displayName || !email || !file) {
+			throw error(400, 'Missing required fields');
+		}
+
+		const endpoint =
+			`${ADV_API_BASE}/adv/upload/${encodeURIComponent(country)}/${encodeURIComponent(uid)}/${encodeURIComponent(displayName)}/${encodeURIComponent(email)}` +
+			`?regenerate=${encodeURIComponent(regenerate)}`;
+
+		console.log('[Adv Upload Proxy] Endpoint:', endpoint, 'file:', file.name);
+
+		// Upstream expects the multipart field name `files`.
+		const uploadFormData = new FormData();
+		uploadFormData.append('files', file);
+
+		const response = await fetch(endpoint, {
+			method: 'POST',
+			body: uploadFormData
+		});
+
+		if (!response.ok) {
+			const errorData = await response.json().catch(() => ({ detail: response.statusText }));
+			throw error(response.status, errorData.detail || 'Upload failed');
+		}
+
+		const result = await response.json();
+		return json(result);
+	} catch (err) {
+		console.error('[Adv Upload Proxy] Error:', err);
+
+		if (err && typeof err === 'object' && 'status' in err) {
+			throw err;
+		}
+
+		throw error(500, err instanceof Error ? err.message : 'Internal server error');
+	}
+};