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/api.js

@@ -3,7 +3,7 @@ import { EmbedBuilder } from 'discord.js';
 import { listDevlogs, searchDevlogs, listCommits, listReleases, archiveStats, getSetting, setSetting } from '../db.js';
 import { config } from '../config.js';
 import { removeDevlog } from '../bot/devlog-archive.js';
-import { commitChannelId, devlogChannelId, releaseChannelId } from '../runtime-settings.js';
+import { commitChannelId, devlogChannelId, releaseChannelId, devlogPingRoleId } from '../runtime-settings.js';
 import { getSessionUser, isAdmin } from './auth.js';
 
 const PAGE_SIZE = 20;
@@ -116,11 +116,25 @@ ${rssItems}
         return channels.sort((a, b) => a.name.localeCompare(b.name));
     }
 
+    /** Rollen, die der Bot vergeben kann (unter seiner höchsten Rolle, nicht managed) */
+    function listRoles() {
+        const roles = [];
+        for (const guild of client.guilds.cache.values()) {
+            for (const role of guild.roles?.cache?.values() ?? []) {
+                if (role.id === guild.id) continue; // @everyone
+                if (role.managed) continue; // Bot-/Integrations-Rollen
+                roles.push({ id: role.id, name: role.name, guild: guild.name });
+            }
+        }
+        return roles.sort((a, b) => a.name.localeCompare(b.name));
+    }
+
     function currentSettings() {
         return {
             commit_channel_id: commitChannelId(),
             devlog_channel_id: devlogChannelId(),
             release_channel_id: releaseChannelId() ?? '',
+            devlog_ping_role_id: devlogPingRoleId() ?? '',
             commit_feed_enabled: getSetting('commit_feed_enabled') !== '0',
             commit_branch_filter: getSetting('commit_branch_filter') ?? '',
             ignored_repos: getSetting('ignored_repos') ?? '',
@@ -133,6 +147,7 @@ ${rssItems}
         const stats = archiveStats();
         return {
             channels: listChannels(),
+            roles: listRoles(),
             settings: currentSettings(),
             status: {
                 botTag: client.user?.tag ?? null,
@@ -162,6 +177,19 @@ ${rssItems}
             }
             setSetting(key, value);
         }
+        // Ping-Rolle: muss existieren ('' = kein Ping)
+        if (body.devlog_ping_role_id !== undefined) {
+            const value = String(body.devlog_ping_role_id);
+            if (value !== '') {
+                const exists = [...client.guilds.cache.values()].some((g) =>
+                    g.roles?.cache?.has?.(value)
+                );
+                if (!exists) {
+                    return reply.code(400).send({ error: 'devlog_ping_role_id: Rolle nicht gefunden' });
+                }
+            }
+            setSetting('devlog_ping_role_id', value);
+        }
         if (body.commit_feed_enabled !== undefined) {
             setSetting('commit_feed_enabled', body.commit_feed_enabled ? '1' : '0');
         }