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/lib/paraglide/messages/_index.js

@@ -339,6 +339,7 @@ export * from './admin_nav_analytics.js'
 export * from './admin_nav_logs.js'
 export * from './admin_nav_uptime.js'
 export * from './admin_nav_push.js'
+export * from './admin_nav_gitea.js'
 export * from './admin_scrape_status_idle.js'
 export * from './admin_scrape_full_catalogue.js'
 export * from './admin_scrape_single_book.js'

ui/src/lib/paraglide/messages/admin_nav_gitea.js

@@ -0,0 +1,44 @@
+/* eslint-disable */
+import { getLocale, experimentalStaticLocale } from '../runtime.js';
+
+/** @typedef {import('../runtime.js').LocalizedString} LocalizedString */
+
+/** @typedef {{}} Admin_Nav_GiteaInputs */
+
+const en_admin_nav_gitea = /** @type {(inputs: Admin_Nav_GiteaInputs) => LocalizedString} */ () => {
+	return /** @type {LocalizedString} */ (`Gitea`)
+};
+
+const ru_admin_nav_gitea = /** @type {(inputs: Admin_Nav_GiteaInputs) => LocalizedString} */ () => {
+	return /** @type {LocalizedString} */ (`Gitea`)
+};
+
+const id_admin_nav_gitea = /** @type {(inputs: Admin_Nav_GiteaInputs) => LocalizedString} */ () => {
+	return /** @type {LocalizedString} */ (`Gitea`)
+};
+
+const pt_admin_nav_gitea = /** @type {(inputs: Admin_Nav_GiteaInputs) => LocalizedString} */ () => {
+	return /** @type {LocalizedString} */ (`Gitea`)
+};
+
+const fr_admin_nav_gitea = /** @type {(inputs: Admin_Nav_GiteaInputs) => LocalizedString} */ () => {
+	return /** @type {LocalizedString} */ (`Gitea`)
+};
+
+/**
+* | output |
+* | --- |
+* | "Gitea" |
+*
+* @param {Admin_Nav_GiteaInputs} inputs
+* @param {{ locale?: "en" | "ru" | "id" | "pt" | "fr" }} options
+* @returns {LocalizedString}
+*/
+export const admin_nav_gitea = /** @type {((inputs?: Admin_Nav_GiteaInputs, options?: { locale?: "en" | "ru" | "id" | "pt" | "fr" }) => LocalizedString) & import('../runtime.js').MessageMetadata<Admin_Nav_GiteaInputs, { locale?: "en" | "ru" | "id" | "pt" | "fr" }, {}>} */ ((inputs = {}, options = {}) => {
+	const locale = experimentalStaticLocale ?? options.locale ?? getLocale()
+	if (locale === "en") return en_admin_nav_gitea(inputs)
+	if (locale === "ru") return ru_admin_nav_gitea(inputs)
+	if (locale === "id") return id_admin_nav_gitea(inputs)
+	if (locale === "pt") return pt_admin_nav_gitea(inputs)
+	return fr_admin_nav_gitea(inputs)
+});