Feature-Voting, Giveaways und Contribution-Heatmap

- /wunsch: Voting-Embed mit 👍, Reaction-Tracking (add/remove) in SQLite,
  Top-20-Rangliste öffentlich auf der Roadmap-Seite
- /giveaway (Admin): Preis/Dauer/Gewinnerzahl, 🎉-Teilnahme-Button (toggle),
  Minuten-Scheduler zieht Gewinner, schließt das Embed ab und pingt sie
- Contribution-Heatmap: 52-Wochen-Grid in Brand-Gelb aus dem Commit-Archiv
  (/api/heatmap) auf der Roadmap-Seite
- Setting voting_channel_id auf der Setup-Seite

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, createApiKey, listApiKeys, deleteApiKey,
-    listGallery, listPlaytesters,
+    listGallery, listPlaytesters, topWishes, commitHeatmap,
 } from '../db.js';
 import { config } from '../config.js';
 import { removeDevlog } from '../bot/devlog-archive.js';
@@ -71,6 +71,10 @@ export function registerApiRoutes(app, client) {
         return { playtesters: listPlaytesters() };
     });
 
+    // Community-Wünsche (Top 20) + Commit-Heatmap — öffentlich
+    app.get('/api/wishes', async () => ({ wishes: topWishes(20) }));
+    app.get('/api/heatmap', async () => ({ days: commitHeatmap() }));
+
     // Roadmap — öffentlich, aus Gitea-Milestones (5-Minuten-Cache gegen API-Hammering)
     let roadmapCache = { at: 0, repo: null, data: null };
     app.get('/api/roadmap', async (request, reply) => {
@@ -207,6 +211,7 @@ ${rssItems}
             welcome_channel_id: getSetting('welcome_channel_id') ?? '',
             modlog_channel_id: getSetting('modlog_channel_id') ?? '',
             status_channel_id: getSetting('status_channel_id') ?? '',
+            voting_channel_id: getSetting('voting_channel_id') ?? '',
             gameservers: getSetting('gameservers') ?? '',
         };
     }
@@ -239,7 +244,7 @@ ${rssItems}
         const OPTIONAL_CHANNELS = [
             'release_channel_id', 'backup_channel_id', 'starboard_channel_id',
             'screenshot_channel_id', 'modmail_channel_id', 'welcome_channel_id',
-            'modlog_channel_id', 'status_channel_id',
+            'modlog_channel_id', 'status_channel_id', 'voting_channel_id',
         ];
         for (const key of ['commit_channel_id', 'devlog_channel_id', ...OPTIONAL_CHANNELS]) {
             if (body[key] === undefined) continue;