feat: live Gitea changelog, Gitea sidebar link, release title/body extraction

- Admin changelog page now fetches releases live from the public Gitea
  API (https://gitea.kalekber.cc) instead of a baked releases.json file
- Remove /static/releases.json from ui/.gitignore (no longer generated)
- Add Gitea to admin sidebar external tools (admin_nav_gitea i18n key,
  all 5 locales, compiled paraglide JS force-added)
- release.yaml: remove 'Fetch releases from Gitea API' step; extract
  release title and body from the tagged commit message for Gitea releases

ui/src/routes/admin/+layout.svelte

@@ -15,7 +15,8 @@
 		{ href: 'https://analytics.libnovel.cc', label: () => m.admin_nav_analytics() },
 		{ href: 'https://logs.libnovel.cc', label: () => m.admin_nav_logs() },
 		{ href: 'https://uptime.libnovel.cc', label: () => m.admin_nav_uptime() },
-		{ href: 'https://push.libnovel.cc', label: () => m.admin_nav_push() }
+		{ href: 'https://push.libnovel.cc', label: () => m.admin_nav_push() },
+		{ href: 'https://gitea.kalekber.cc/kamil/libnovel', label: () => m.admin_nav_gitea() }
 	];
 
 	interface Props {

ui/src/routes/admin/changelog/+page.server.ts

@@ -1,5 +1,3 @@
-import { readFileSync } from 'fs';
-import { join } from 'path';
 import type { PageServerLoad } from './$types';
 
 export interface Release {
@@ -12,13 +10,18 @@ export interface Release {
 	draft: boolean;
 }
 
-export const load: PageServerLoad = async () => {
+const GITEA_RELEASES_URL =
+	'https://gitea.kalekber.cc/api/v1/repos/kamil/libnovel/releases?limit=50&page=1';
+
+export const load: PageServerLoad = async ({ fetch }) => {
 	try {
-		// releases.json is baked into the image at build time by CI.
-		// SvelteKit Node adapter copies static/ → build/client/, so the file
-		// lives at <cwd>/build/client/releases.json in production.
-		const raw = readFileSync(join(process.cwd(), 'build', 'client', 'releases.json'), 'utf-8');
-		const releases: Release[] = JSON.parse(raw);
+		const res = await fetch(GITEA_RELEASES_URL, {
+			headers: { Accept: 'application/json' }
+		});
+		if (!res.ok) {
+			return { releases: [], error: `Gitea API returned ${res.status}` };
+		}
+		const releases: Release[] = await res.json();
 		return { releases: releases.filter((r) => !r.draft) };
 	} catch (e) {
 		return { releases: [], error: String(e) };