fix(ci): strip 'build' from .dockerignore before docker-ui build

When PREBUILT=1 the pre-built artifact is downloaded into ui/build/ but
.dockerignore excludes 'build', so Docker never sees it and /app/build
doesn't exist in the builder stage — causing the runtime COPY to fail.

Fix: rewrite ui/.dockerignore on the CI runner (grep -v '^build$') so the
pre-built directory is included in the Docker context.

Also in this commit:
- book page: gate EPUB download on isPro (UI upsell + server 403 guard)
- book page: chapter names default pattern changed to '{scene}'

.gitea/workflows/release.yaml

@@ -239,6 +239,11 @@ jobs:
           name: ui-build-injected
           path: ui/build
 
+      - name: Allow build/ into Docker context (override .dockerignore)
+        run: |
+          grep -v '^build$' ui/.dockerignore > ui/.dockerignore.tmp
+          mv ui/.dockerignore.tmp ui/.dockerignore
+
       - uses: docker/setup-buildx-action@v3
 
       - name: Log in to Docker Hub

ui/src/routes/api/export/[slug]/+server.ts

@@ -2,7 +2,11 @@ import { error } from '@sveltejs/kit';
 import type { RequestHandler } from './$types';
 import { backendFetch } from '$lib/server/scraper';
 
-export const GET: RequestHandler = async ({ params, url }) => {
+export const GET: RequestHandler = async ({ params, url, locals }) => {
+	if (!locals.isPro) {
+		error(403, 'EPUB download requires a Pro subscription');
+	}
+
 	const { slug } = params;
 	const from = url.searchParams.get('from');
 	const to = url.searchParams.get('to');

ui/src/routes/books/[slug]/+page.server.ts

@@ -64,8 +64,9 @@ export const load: PageServerLoad = async ({ params, locals }) => {
 				lastChapter: null,
 				userRating: 0,
 				ratingAvg: { avg: 0, count: 0 },
-				isAdmin: locals.user?.role === 'admin',
-				isLoggedIn: !!locals.user,
+		isAdmin: locals.user?.role === 'admin',
+		isPro: locals.isPro,
+		isLoggedIn: !!locals.user,
 				currentUserId: locals.user?.id ?? '',
 				scraping: true,
 				taskId: body.task_id

ui/src/routes/books/[slug]/+page.svelte

@@ -326,7 +326,7 @@
 	let chapNamesPreview = $state<{ number: number; old_title: string; new_title: string; edited: string }[]>([]);
 	let chapNamesApplying = $state(false);
 	let chapNamesResult = $state<'applied' | 'error' | ''>('');
-	let chapNamesPattern = $state('Chapter {n}: {scene}');
+	let chapNamesPattern = $state('{scene}');
 	let chapNamesBatchProgress = $state('');
 	let chapNamesBatchWarnings = $state<string[]>([]);
 
@@ -342,7 +342,7 @@
 			const res = await fetch('/api/admin/text-gen/chapter-names', {
 				method: 'POST',
 				headers: { 'Content-Type': 'application/json' },
-				body: JSON.stringify({ slug, pattern: chapNamesPattern.trim() || 'Chapter {n}: {scene}' })
+				body: JSON.stringify({ slug, pattern: chapNamesPattern.trim() || '{scene}' })
 			});
 			if (!res.ok) {
 				chapNamesResult = 'error';
@@ -835,13 +835,22 @@
 		<p class="text-sm font-medium text-(--color-text)">Download</p>
 		<p class="text-xs text-(--color-muted)">All {chapterList.length} chapters as EPUB</p>
 	</div>
-	<a
-		href="/api/export/{book.slug}"
-		download="{book.slug}.epub"
-		class="px-3 py-1.5 rounded-lg bg-(--color-surface-2) border border-(--color-border) text-sm font-medium text-(--color-muted) hover:text-(--color-text) hover:border-zinc-500 transition-colors flex-shrink-0"
-	>
-		.epub
-	</a>
+	{#if data.isPro}
+		<a
+			href="/api/export/{book.slug}"
+			download="{book.slug}.epub"
+			class="px-3 py-1.5 rounded-lg bg-(--color-surface-2) border border-(--color-border) text-sm font-medium text-(--color-muted) hover:text-(--color-text) hover:border-zinc-500 transition-colors flex-shrink-0"
+		>
+			.epub
+		</a>
+	{:else}
+		<a
+			href="/profile"
+			class="px-3 py-1.5 rounded-lg bg-(--color-brand)/15 border border-(--color-brand)/30 text-sm font-medium text-(--color-brand) hover:bg-(--color-brand)/25 transition-colors flex-shrink-0"
+		>
+			Pro
+		</a>
+	{/if}
 </div>
 {/if}
 
@@ -1135,7 +1144,7 @@
 					<input
 						type="text"
 						bind:value={chapNamesPattern}
-						placeholder="Chapter {'{n}'}: {'{scene}'}"
+						placeholder="{'{scene}'}"
 						class="w-full px-2 py-1.5 rounded bg-(--color-surface-3) border border-(--color-border) text-(--color-text) text-xs focus:outline-none focus:border-(--color-brand)"
 					/>
 					<div class="flex items-center gap-3 flex-wrap">