feat: add AI Jobs admin page, cache model lists, improve image-gen 502 UX

- Add /admin/ai-jobs page with live-polling jobs table, status badges, progress bars, and cancel action
- Add listAIJobs() helper in pocketbase.ts; AIJob type
- Add POST /api/admin/ai-jobs/[id]/cancel SvelteKit proxy
- Add ai-jobs link to admin sidebar nav (all 5 locales)
- Cache image-gen and text-gen model lists in Valkey (10 min TTL) via scraper.ts helpers
- Cache changelog Gitea API response (5 min TTL)
- Improve 502/504 error message on image-gen page with CF AI timeout hint
- Show CF AI timeout warning in advanced options when a Cloudflare/FLUX model is selected

ui/src/lib/server/scraper.ts

@@ -12,6 +12,7 @@
 
 import { error } from '@sveltejs/kit';
 import { env } from '$env/dynamic/private';
+import * as cache from '$lib/server/cache';
 
 export const BACKEND_URL = env.BACKEND_API_URL ?? 'http://localhost:8080';
 
@@ -33,6 +34,50 @@ export async function backendFetch(path: string, init?: RequestInit): Promise<Re
 	}
 }
 
+// ─── Cached admin model lists ─────────────────────────────────────────────────
+
+const MODELS_CACHE_TTL = 10 * 60; // 10 minutes — model lists rarely change
+
+/**
+ * Fetch image-gen model list from the Go backend with a 10-minute cache.
+ * Returns an empty array on error (callers should surface a warning).
+ */
+export async function listImageModels<T>(): Promise<T[]> {
+	const key = 'backend:models:image-gen';
+	const cached = await cache.get<T[]>(key);
+	if (cached) return cached;
+	try {
+		const res = await backendFetch('/api/admin/image-gen/models');
+		if (!res.ok) return [];
+		const data = await res.json();
+		const models = (data.models ?? []) as T[];
+		await cache.set(key, models, MODELS_CACHE_TTL);
+		return models;
+	} catch {
+		return [];
+	}
+}
+
+/**
+ * Fetch text-gen model list from the Go backend with a 10-minute cache.
+ * Returns an empty array on error.
+ */
+export async function listTextModels<T>(): Promise<T[]> {
+	const key = 'backend:models:text-gen';
+	const cached = await cache.get<T[]>(key);
+	if (cached) return cached;
+	try {
+		const res = await backendFetch('/api/admin/text-gen/models');
+		if (!res.ok) return [];
+		const data = await res.json();
+		const models = (data.models ?? []) as T[];
+		await cache.set(key, models, MODELS_CACHE_TTL);
+		return models;
+	} catch {
+		return [];
+	}
+}
+
 // ─── Response types ───────────────────────────────────────────────────────────
 
 /**