Setup-Seite: Kanal-Auswahl, Feed-Regeln und Status im Webinterface

- Settings-Tabelle in SQLite; Env-Variablen nur noch Fallback, Änderungen greifen sofort
- /settings (Admin): Devlog-/Commit-Kanal als Dropdown aus allen sichtbaren Textkanälen,
  je mit Test-senden-Button
- Commit-Feed-Regeln: an/aus, Branch-Filter, ignorierte Repos (archiviert wird immer,
  gefiltert wird nur das Posten; ignorierte Repos komplett übersprungen)
- Status-Panel: Bot-Tag, Uptime, Devlog-/Commit-Zahlen, DB-Größe
- API: GET/PUT /api/settings, POST /api/settings/test/:target (alles Admin-only)
- COMMIT_CHANNEL_ID/DEVLOG_CHANNEL_ID in config optional

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

src/web/devlog-endpoint.js

@@ -10,6 +10,7 @@ import { join } from 'node:path';
 import { AttachmentBuilder, EmbedBuilder } from 'discord.js';
 import { config } from '../config.js';
 import { saveDevlog } from '../db.js';
+import { devlogChannelId } from '../runtime-settings.js';
 import { imagesDir } from '../bot/devlog-archive.js';
 
 const BRAND_YELLOW = 0xf5c518;
@@ -64,7 +65,11 @@ export function registerDevlogEndpoint(app, client) {
             return reply.code(400).send({ error: 'empty devlog' });
         }
 
-        const channel = await client.channels.fetch(config.devlogChannelId);
+        const targetChannel = devlogChannelId();
+        if (!targetChannel) {
+            return reply.code(500).send({ error: 'no devlog channel configured' });
+        }
+        const channel = await client.channels.fetch(targetChannel);
         if (!channel?.isTextBased()) {
             return reply.code(500).send({ error: 'devlog channel not found' });
         }