Add iOS app, SvelteKit JSON API endpoints, and Gitea CI workflow

- iOS SwiftUI app (ios/LibNovel/) targeting iOS 17+, generated via xcodegen
  - Full feature set: auth, home, library, book detail, chapter reader, browse, audio player, profile
  - Kingfisher for image loading, swift-markdown-ui for chapter rendering
  - Base URL: https://v2.libnovel.kalekber.cc
- SvelteKit JSON API routes (ui/src/routes/api/) for iOS consumption:
  auth/login, auth/register, auth/me, auth/logout, auth/change-password,
  home, library, book/[slug], chapter/[slug]/[n], search, ranking,
  progress/[slug], presign/audio (updated)
- Gitea Actions CI: .gitea/workflows/ios.yaml (build + test on macos-latest)
- justfile: ios-gen, ios-build, ios-test recipes

ui/src/routes/api/ranking/+server.ts

@@ -0,0 +1,27 @@
+import { json, error } from '@sveltejs/kit';
+import type { RequestHandler } from './$types';
+import { env } from '$env/dynamic/private';
+import { log } from '$lib/server/logger';
+
+const SCRAPER_URL = env.SCRAPER_API_URL ?? 'http://localhost:8080';
+
+/**
+ * GET /api/ranking
+ * Proxies to the Go scraper's /api/ranking endpoint.
+ * Returns the top-ranked novels list as JSON.
+ */
+export const GET: RequestHandler = async () => {
+	try {
+		const res = await fetch(`${SCRAPER_URL}/api/ranking`);
+		if (!res.ok) {
+			log.error('api/ranking', 'scraper returned error', { status: res.status });
+			error(502, `Ranking fetch failed: ${res.status}`);
+		}
+		const data = await res.json();
+		return json(data);
+	} catch (e) {
+		if (e instanceof Error && 'status' in e) throw e;
+		log.error('api/ranking', 'network error', { err: String(e) });
+		error(502, 'Could not load ranking');
+	}
+};