feat: ATM10-Statistikportal

Statistikportal für den All-the-Mods-10-Server (Minecraft 1.21.1, NeoForge 21.1):

- mod/: serverseitige NeoForge-Mod atmstats – Ereignisse, Live-Zähler, Servergesundheit,
  FTB-Dateien; Outbox auf der Festplatte, signierter gzip-Versand per HTTPS mit Backoff
- backend/: Fastify + PostgreSQL – idempotenter Ingest, Projektionen, Parser für SNBT,
  FTB Quests/Teams, world/stats, world/advancements und latest.log; Ranglisten, Snapshots,
  Retention, öffentliche API, SSE-Live-Updates, Admin mit argon2/CSRF, SFTP-Worker
- web/: Next.js-Dashboard – Übersicht, Ranglisten, Spielerprofile, ATM10, Server,
  Datenquellen, Verwaltung
- shared/: Protokoll v1 und API-Typen; tools/: Simulator, Log-Anonymisierer, RCON-Client
- deploy/: Docker Compose hinter Traefik, Backup; docs/: Architektur, Datenquellen, Betrieb

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

backend/src/db/pool.ts

@@ -0,0 +1,28 @@
+import pg from 'pg';
+
+// bigint (int8) columns hold Minecraft counters; they stay far below 2^53, so parse as number.
+pg.types.setTypeParser(20, (v) => Number(v));
+// numeric is used for aggregates (SUM over bigint)
+pg.types.setTypeParser(1700, (v) => Number(v));
+
+export type Pool = pg.Pool;
+export type PoolClient = pg.PoolClient;
+
+export function createPool(url: string, max = 10): pg.Pool {
+  return new pg.Pool({ connectionString: url, max });
+}
+
+export async function withTx<T>(pool: pg.Pool, fn: (c: pg.PoolClient) => Promise<T>): Promise<T> {
+  const client = await pool.connect();
+  try {
+    await client.query('BEGIN');
+    const result = await fn(client);
+    await client.query('COMMIT');
+    return result;
+  } catch (err) {
+    await client.query('ROLLBACK').catch(() => {});
+    throw err;
+  } finally {
+    client.release();
+  }
+}