feat: add Cloudflare AI TTS engine (aura-2-en) with voice grouping in UI

ui/src/lib/components/AudioPlayer.svelte

@@ -86,6 +86,7 @@
 	// ── Derived: voices grouped by engine ──────────────────────────────────
 	const kokoroVoices = $derived(voices.filter((v) => v.engine === 'kokoro'));
 	const pocketVoices = $derived(voices.filter((v) => v.engine === 'pocket-tts'));
+	const cfaiVoices = $derived(voices.filter((v) => v.engine === 'cfai'));
 
 	// ── Voice selector state ────────────────────────────────────────────────
 	let showVoicePanel = $state(false);
@@ -98,6 +99,7 @@
 	 * Human-readable label for a voice.
 	 * Kokoro: "af_bella" → "Bella (US F)"
 	 * Pocket-TTS: "alba" → "Alba (EN F)"
+	 * CF AI: "cfai:luna" → "Luna (EN F)"
 	 * Falls back gracefully if called with a bare string (e.g. from the store default).
 	 */
 	function voiceLabel(v: Voice | string): string {
@@ -110,6 +112,14 @@
 			return kokoroLabelFromId(v);
 		}
 
+		if (v.engine === 'cfai') {
+			// "cfai:luna" → "Luna (EN F)"
+			const speaker = v.id.startsWith('cfai:') ? v.id.slice(5) : v.id;
+			const name = speaker.replace(/\b\w/g, (c) => c.toUpperCase());
+			const genderLabel = v.gender.toUpperCase();
+			return `${name} (EN ${genderLabel})`;
+		}
+
 		if (v.engine === 'pocket-tts') {
 			const langLabel = v.lang.toUpperCase().replace('-', '');
 			const genderLabel = v.gender.toUpperCase();
@@ -844,6 +854,16 @@
 						{@render voiceRow(v)}
 					{/each}
 				{/if}
+
+				<!-- Cloudflare AI section -->
+				{#if cfaiVoices.length > 0}
+					<div class="px-3 py-1.5 bg-(--color-surface-2)/70 border-b border-(--color-border)/50 {kokoroVoices.length > 0 || pocketVoices.length > 0 ? 'border-t border-(--color-border)' : ''}">
+						<span class="text-[10px] font-semibold text-(--color-muted) uppercase tracking-widest">Cloudflare AI</span>
+					</div>
+					{#each cfaiVoices as v (v.id)}
+						{@render voiceRow(v)}
+					{/each}
+				{/if}
 			</div>
 			<div class="px-3 py-2 border-t border-(--color-border) bg-(--color-surface-2)/50">
 				<p class="text-xs text-(--color-muted)">

ui/src/lib/types.ts

@@ -12,7 +12,7 @@
 export interface Voice {
 	/** Voice identifier passed to TTS clients (e.g. "af_bella", "alba"). */
 	id: string;
-	/** TTS engine: "kokoro" | "pocket-tts". */
+	/** TTS engine: "kokoro" | "pocket-tts" | "cfai". */
 	engine: string;
 	/** Primary language tag (e.g. "en-us", "en-gb", "en", "es", "fr"). */
 	lang: string;

ui/src/routes/admin/audio/+page.svelte

@@ -57,6 +57,12 @@
 		return `${m}m ${s % 60}s`;
 	}
 
+	function engineLabel(voice: string): string {
+		if (voice.startsWith('cfai:')) return 'CF AI';
+		if (!voice.includes('_')) return 'Pocket TTS';
+		return 'Kokoro';
+	}
+
 	// ── Audio jobs stats + filter ────────────────────────────────────────────────
 	let jobsQ = $state('');
 	let filteredJobs = $derived(
@@ -160,6 +166,7 @@
 							<th class="px-4 py-3 text-left">Book</th>
 							<th class="px-4 py-3 text-right">Ch.</th>
 							<th class="px-4 py-3 text-left">Voice</th>
+							<th class="px-4 py-3 text-left">Engine</th>
 							<th class="px-4 py-3 text-left">Status</th>
 							<th class="px-4 py-3 text-left">Started</th>
 							<th class="px-4 py-3 text-left">Duration</th>
@@ -173,6 +180,7 @@
 								</td>
 								<td class="px-4 py-3 text-right text-(--color-muted)">{job.chapter}</td>
 								<td class="px-4 py-3 text-(--color-muted) font-mono text-xs">{job.voice}</td>
+								<td class="px-4 py-3 text-(--color-muted) text-xs">{engineLabel(job.voice)}</td>
 								<td class="px-4 py-3">
 									<span class="font-medium {jobStatusColor(job.status)}">{job.status}</span>
 								</td>
@@ -181,7 +189,7 @@
 							</tr>
 							{#if job.error_message}
 								<tr class="bg-(--color-danger)/10">
-									<td colspan="6" class="px-4 py-2 text-xs text-(--color-danger) font-mono">{job.error_message}</td>
+									<td colspan="7" class="px-4 py-2 text-xs text-(--color-danger) font-mono">{job.error_message}</td>
 								</tr>
 							{/if}
 						{/each}
@@ -202,6 +210,7 @@
 						<div class="grid grid-cols-2 gap-1 text-xs">
 							<span class="text-(--color-muted)">Chapter</span><span class="text-(--color-muted) text-right">{job.chapter}</span>
 							<span class="text-(--color-muted)">Voice</span><span class="text-(--color-muted) font-mono text-right truncate">{job.voice}</span>
+							<span class="text-(--color-muted)">Engine</span><span class="text-(--color-muted) text-right">{engineLabel(job.voice)}</span>
 							<span class="text-(--color-muted)">Started</span><span class="text-(--color-muted) text-right">{fmtDate(job.started)}</span>
 							<span class="text-(--color-muted)">Duration</span><span class="text-(--color-muted) text-right">{duration(job.started, job.finished)}</span>
 						</div>
@@ -236,6 +245,7 @@
 							<th class="px-4 py-3 text-left">Book</th>
 							<th class="px-4 py-3 text-left">Chapter</th>
 							<th class="px-4 py-3 text-left">Voice</th>
+							<th class="px-4 py-3 text-left">Engine</th>
 							<th class="px-4 py-3 text-left">Filename</th>
 							<th class="px-4 py-3 text-left">Updated</th>
 						</tr>
@@ -249,6 +259,7 @@
 								</td>
 								<td class="px-4 py-3 text-(--color-muted)">{parts.chapter}</td>
 								<td class="px-4 py-3 text-(--color-muted) font-mono text-xs">{parts.voice}</td>
+								<td class="px-4 py-3 text-(--color-muted) text-xs">{engineLabel(parts.voice)}</td>
 								<td class="px-4 py-3 text-(--color-muted) font-mono text-xs truncate max-w-[14rem]" title={entry.filename}>
 									{entry.filename}
 								</td>
@@ -267,11 +278,12 @@
 						<a href="/books/{parts.slug}" class="text-(--color-text) font-medium hover:text-(--color-brand) transition-colors block truncate">
 							{parts.slug}
 						</a>
-						<div class="grid grid-cols-2 gap-1 text-xs">
-							<span class="text-(--color-muted)">Chapter</span><span class="text-(--color-muted) text-right">{parts.chapter}</span>
-							<span class="text-(--color-muted)">Voice</span><span class="text-(--color-muted) font-mono text-right truncate">{parts.voice}</span>
-							<span class="text-(--color-muted)">Updated</span><span class="text-(--color-muted) text-right">{fmtDate(entry.updated)}</span>
-						</div>
+					<div class="grid grid-cols-2 gap-1 text-xs">
+						<span class="text-(--color-muted)">Chapter</span><span class="text-(--color-muted) text-right">{parts.chapter}</span>
+						<span class="text-(--color-muted)">Voice</span><span class="text-(--color-muted) font-mono text-right truncate">{parts.voice}</span>
+						<span class="text-(--color-muted)">Engine</span><span class="text-(--color-muted) text-right">{engineLabel(parts.voice)}</span>
+						<span class="text-(--color-muted)">Updated</span><span class="text-(--color-muted) text-right">{fmtDate(entry.updated)}</span>
+					</div>
 						{#if entry.filename}
 							<p class="text-xs text-(--color-muted) font-mono truncate" title={entry.filename}>{entry.filename}</p>
 						{/if}

ui/src/routes/profile/+page.svelte

@@ -93,6 +93,30 @@
 
 	const kokoroVoices = $derived(voices.filter((v) => v.engine === 'kokoro'));
 	const pocketVoices = $derived(voices.filter((v) => v.engine === 'pocket-tts'));
+	const cfaiVoices = $derived(voices.filter((v) => v.engine === 'cfai'));
+
+	function voiceLabel(v: Voice): string {
+		if (v.engine === 'cfai') {
+			const speaker = v.id.startsWith('cfai:') ? v.id.slice(5) : v.id;
+			return speaker.replace(/\b\w/g, (c) => c.toUpperCase()) + (v.gender ? ` (EN ${v.gender.toUpperCase()})` : '');
+		}
+		if (v.engine === 'pocket-tts') {
+			const name = v.id.replace(/_/g, ' ').replace(/\b\w/g, (c) => c.toUpperCase());
+			return name + (v.gender ? ` (EN ${v.gender.toUpperCase()})` : '');
+		}
+		// Kokoro: "af_bella" → "Bella (US F)"
+		const langMap: Record<string, string> = {
+			af: 'US', am: 'US', bf: 'UK', bm: 'UK',
+			ef: 'ES', em: 'ES', ff: 'FR',
+			hf: 'IN', hm: 'IN', 'if': 'IT', im: 'IT',
+			jf: 'JP', jm: 'JP', pf: 'PT', pm: 'PT', zf: 'ZH', zm: 'ZH',
+		};
+		const prefix = v.id.slice(0, 2);
+		const name = v.id.slice(3).replace(/^v0/, '').replace(/^([a-z])/, (c) => c.toUpperCase());
+		const lang = langMap[prefix] ?? prefix.toUpperCase();
+		const gender = v.gender ? v.gender.toUpperCase() : '?';
+		return `${name} (${lang} ${gender})`;
+	}
 
 	$effect(() => {
 		fetch('/api/voices')
@@ -492,12 +516,17 @@
 					class="w-full bg-(--color-surface-3) border border-(--color-border) rounded-lg px-3 py-2 text-(--color-text) text-sm focus:outline-none focus:ring-2 focus:ring-(--color-brand)">
 					{#if kokoroVoices.length > 0}
 						<optgroup label="Kokoro (GPU)">
-							{#each kokoroVoices as v}<option value={v.id}>{v.id}</option>{/each}
+							{#each kokoroVoices as v}<option value={v.id}>{voiceLabel(v)}</option>{/each}
 						</optgroup>
 					{/if}
 					{#if pocketVoices.length > 0}
 						<optgroup label="Pocket TTS (CPU)">
-							{#each pocketVoices as v}<option value={v.id}>{v.id}</option>{/each}
+							{#each pocketVoices as v}<option value={v.id}>{voiceLabel(v)}</option>{/each}
+						</optgroup>
+					{/if}
+					{#if cfaiVoices.length > 0}
+						<optgroup label="Cloudflare AI">
+							{#each cfaiVoices as v}<option value={v.id}>{voiceLabel(v)}</option>{/each}
 						</optgroup>
 					{/if}
 				</select>