Rollen-Ping beim Devlog: Erwähnung + Abo-Button

- Setting devlog_ping_role_id (Rollen-Dropdown auf der Setup-Seite, leer = aus)
- Devlog-Post erwähnt die Rolle (allowedMentions gescoped) und trägt einen
  🔔-Button, über den Member die Rolle selbst an-/abmelden (ephemere Bestätigung)
- API liefert vergebbare Rollen (ohne @everyone/managed), PUT validiert

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

src/web/devlog-endpoint.js

@@ -10,7 +10,7 @@ import { join } from 'node:path';
 import { ActionRowBuilder, AttachmentBuilder, ButtonBuilder, ButtonStyle, EmbedBuilder } from 'discord.js';
 import { config } from '../config.js';
 import { saveDevlog } from '../db.js';
-import { devlogChannelId } from '../runtime-settings.js';
+import { devlogChannelId, devlogPingRoleId } from '../runtime-settings.js';
 import { imagesDir } from '../bot/devlog-archive.js';
 
 const BRAND_YELLOW = 0xf5c518;
@@ -123,7 +123,7 @@ export function registerDevlogEndpoint(app, client) {
             }
         });
 
-        // Link-Buttons unterm Embed: Archiv-Seite + Repo
+        // Link-Buttons unterm Embed: Archiv-Seite + Repo + Abo-Button für die Ping-Rolle
         const buttons = new ActionRowBuilder().addComponents(
             new ButtonBuilder().setStyle(ButtonStyle.Link).setLabel('Devlog-Archiv').setEmoji('🗂️').setURL(groupUrl)
         );
@@ -133,7 +133,26 @@ export function registerDevlogEndpoint(app, client) {
             );
         }
 
-        const message = await channel.send({ embeds, files: attachments, components: [buttons] });
+        // Ping-Rolle: Rolle erwähnen + Abo-Button anbieten (Setup-Seite)
+        const pingRole = devlogPingRoleId();
+        if (pingRole) {
+            buttons.addComponents(
+                new ButtonBuilder()
+                    .setStyle(ButtonStyle.Secondary)
+                    .setLabel('Benachrichtigungen')
+                    .setEmoji('🔔')
+                    .setCustomId('devlog_ping_toggle')
+            );
+        }
+
+        const message = await channel.send({
+            embeds,
+            files: attachments,
+            components: [buttons],
+            ...(pingRole
+                ? { content: `<@&${pingRole}>`, allowedMentions: { roles: [pingRole] } }
+                : {}),
+        });
 
         // Direkt archivieren (der Live-Listener ignoriert eigene Bot-Posts bewusst)
         const imageFiles = [];