Release-Ankündigungen + öffentliche Changelog-Seite

- Gitea-Release-Webhook: Releases werden archiviert (releases-Tabelle) und neue
  'published'-Releases als oranges 🚀-Embed mit Buttons angekündigt
- Release-Kanal auf der Setup-Seite wählbar (leer = Feature aus) + Test-Button
- /changelog: öffentliche Seite mit Tag-Chips, Pre-Release-Badge, Release-Notes
- /api/releases öffentlich; Updates/Redeliveries posten nicht doppelt

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/web/server.js

@@ -8,9 +8,10 @@ import { existsSync } from 'node:fs';
 import { fileURLToPath } from 'node:url';
 import { dirname, join } from 'node:path';
 import { config } from '../config.js';
-import { saveCommits } from '../db.js';
+import { saveCommits, saveRelease } from '../db.js';
 import { commitFeedEnabled, branchAllowed, repoIgnored } from '../runtime-settings.js';
 import { postPushEmbed } from '../bot/commit-feed.js';
+import { postReleaseEmbed } from '../bot/release-feed.js';
 import { registerAuthRoutes } from './auth.js';
 import { registerApiRoutes } from './api.js';
 import { registerDevlogEndpoint } from './devlog-endpoint.js';
@@ -103,8 +104,43 @@ export async function startWebServer(client) {
             return reply.code(401).send({ error: 'invalid signature' });
         }
 
-        // Andere Events (Tag, Issue, …) freundlich ignorieren
         const event = request.headers['x-gitea-event'];
+
+        // Release-Events → Ankündigung + Changelog-Archiv
+        if (event === 'release') {
+            const payload = request.body;
+            const repo = payload.repository?.full_name ?? 'unbekannt';
+            if (repoIgnored(repo) || !payload.release) {
+                return { ok: true, ignored: `release ${repo}` };
+            }
+            const release = {
+                repo,
+                tag: payload.release.tag_name ?? 'unbekannt',
+                name: payload.release.name ?? null,
+                body: payload.release.body ?? null,
+                url: payload.release.html_url ?? null,
+                prerelease: payload.release.prerelease ? 1 : 0,
+                published_at: payload.release.published_at ?? new Date().toISOString(),
+            };
+            const isNew = saveRelease(release);
+            request.log.info(`Release ${release.tag} in ${repo} (${payload.action}, neu: ${isNew})`);
+
+            // Nur neue Releases ankündigen — Updates/Löschungen nur still archivieren
+            let posted = false;
+            if (isNew && payload.action === 'published') {
+                try {
+                    posted = await postReleaseEmbed(client, {
+                        ...release,
+                        prerelease: Boolean(release.prerelease),
+                    });
+                } catch (error) {
+                    request.log.error({ err: error }, 'Release-Embed konnte nicht gepostet werden');
+                }
+            }
+            return { ok: true, release: release.tag, posted };
+        }
+
+        // Andere Events (Tag, Issue, …) freundlich ignorieren
         if (event !== 'push') {
             return { ok: true, ignored: event };
         }