feat: add goal proxy API route

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/routes/api/goals/+server.ts

@@ -0,0 +1,29 @@
+import { json, error } from '@sveltejs/kit';
+import { env } from '$env/dynamic/private';
+import type { RequestHandler } from './$types';
+
+const SERVER_URL = env.SERVER_URL || 'http://localhost:8080';
+
+export const POST: RequestHandler = async ({ request, locals }) => {
+	if (!locals.user) {
+		return error(401, 'Unauthorized');
+	}
+
+	const body = await request.json();
+
+	const res = await fetch(`${SERVER_URL}/goals`, {
+		method: 'POST',
+		headers: {
+			'Content-Type': 'application/json',
+			cookie: request.headers.get('cookie') ?? ''
+		},
+		body: JSON.stringify(body)
+	});
+
+	if (!res.ok) {
+		const err = await res.json().catch(() => ({ error: 'Unknown error' }));
+		return error(res.status, err.error ?? 'Failed to submit goal');
+	}
+
+	return json(await res.json());
+};