Feature 2: Commit-Feed — Gitea-Webhook, Discord-Embeds, SQLite-Archiv

- Fastify-Webserver mit /health und /webhooks/gitea (HMAC-SHA256-Signaturprüfung, timing-safe)
- Push-Commits werden in SQLite gespeichert (Dedupe per SHA) und als Embed gepostet
- Dockerfile auf node:22-slim (glibc-Prebuilds für better-sqlite3), Port 3080 published
- README: Anleitung für Cloudflare-DNS, Nginx Proxy Manager (bot.d4rkst3r.de) und Gitea-Webhook

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

src/bot/commit-feed.js

@@ -0,0 +1,45 @@
+// Baut aus einem Gitea-Push ein hübsches Embed und postet es in den Commit-Kanal
+import { EmbedBuilder } from 'discord.js';
+import { config } from '../config.js';
+
+const GITEA_GREEN = 0x609926;
+const MAX_COMMITS_SHOWN = 10;
+
+/** Erste Zeile der Commit-Message, auf maxLen gekürzt */
+function firstLine(message, maxLen = 72) {
+    const line = message.split('\n')[0].trim();
+    return line.length > maxLen ? `${line.slice(0, maxLen - 1)}…` : line;
+}
+
+/**
+ * Push-Embed in den Commit-Kanal posten.
+ * @param {import('discord.js').Client} client
+ * @param {{ repo: string, repoUrl: string, branch: string, compareUrl: string|null,
+ *           pusherName: string, pusherAvatar: string|null,
+ *           commits: Array<{sha: string, message: string, url: string, author_name: string}> }} push
+ */
+export async function postPushEmbed(client, push) {
+    const channel = await client.channels.fetch(config.commitChannelId);
+    if (!channel?.isTextBased()) {
+        throw new Error(`Commit-Kanal ${config.commitChannelId} nicht gefunden oder kein Textkanal`);
+    }
+
+    const count = push.commits.length;
+    const lines = push.commits.slice(0, MAX_COMMITS_SHOWN).map(
+        (c) => `[\`${c.sha.slice(0, 7)}\`](${c.url}) ${firstLine(c.message)} — ${c.author_name}`
+    );
+    if (count > MAX_COMMITS_SHOWN) {
+        lines.push(`… und ${count - MAX_COMMITS_SHOWN} weitere`);
+    }
+
+    const embed = new EmbedBuilder()
+        .setColor(GITEA_GREEN)
+        .setAuthor({ name: push.pusherName, iconURL: push.pusherAvatar ?? undefined })
+        .setTitle(`📦 ${count} ${count === 1 ? 'neuer Commit' : 'neue Commits'} in ${push.repo}`)
+        .setURL(push.compareUrl || push.repoUrl)
+        .setDescription(lines.join('\n'))
+        .setFooter({ text: `Branch: ${push.branch}` })
+        .setTimestamp();
+
+    await channel.send({ embeds: [embed] });
+}