chore: tidy root files + reorganize a few stale docs

Root file cleanup:
- mac-mini-setup.sh → scripts/mac-mini/bootstrap.sh  (first-time bootstrap
  belongs next to the other mac-mini setup-* scripts)
- test-chat-auth.sh → scripts/test-chat-auth.sh  (ad-hoc smoke test, no
  reason to live in the repo root)
- cloudflared-config.yml stays in root on purpose — it's the single source
  of truth read by scripts/mac-mini/setup-*.sh and scripts/check-status.sh.

Docs:
- docs/POSTMORTEM_2026-04-07.md → docs/postmortems/2026-04-07-memoro-deploy-prod-wipe.md
  (creates the postmortems/ home for future entries; descriptive name)
- docs/future/MAIL_SERVER_MAC_MINI_TEMP.md deleted — what it described
  ("Bereit zur Umsetzung", Stalwart on Mac Mini) is what's actually
  running today, documented in docs/MAIL_SERVER.md. The DEDICATED variant
  in docs/future/ remains since it's still a real future plan.

Root CLAUDE.md fix:
- @mana/local-store description was wrong — claimed it was legacy/standalone
  only, but it's still used by apps/mana/apps/web itself, plus manavoxel,
  arcade, and three shared packages.

Not touched (flagged for follow-up):
- NewAppIdeas/ (344K of "Roblox Reimagined" planning notes in repo root) —
  user decision: archive externally or move under docs/future/
- Doc giants (PROJECT_OVERVIEW 41k, MATRIX_BOT_ARCHITECTURE 36k, etc.) —
  splitting them is its own refactor
- Service CLAUDE.md staleness audit across 18 services — too broad for
  this pass

scripts/mac-mini/bootstrap.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+# Mac Mini Server Setup Script
+# Kopiere diese Datei auf den Mac Mini und führe aus:
+# chmod +x mac-mini-setup.sh && ./mac-mini-setup.sh
+
+echo "=== Mac Mini Server Setup ==="
+echo ""
+
+# 1. Cloudflare Tunnel installieren
+echo "📦 Installiere cloudflared..."
+brew install cloudflared
+
+# 2. Git installieren (falls nicht vorhanden)
+echo "📦 Installiere git..."
+brew install git
+
+# 3. Verzeichnis erstellen
+echo "📁 Erstelle Projekt-Verzeichnis..."
+mkdir -p ~/projects
+cd ~/projects
+
+# 4. Repository klonen
+echo "📥 Klone Repository..."
+git clone https://github.com/Memo-2023/mana-monorepo.git
+cd mana-monorepo
+
+echo ""
+echo "✅ Basis-Setup abgeschlossen!"
+echo ""
+echo "=== NÄCHSTE SCHRITTE (manuell) ==="
+echo ""
+echo "1. Cloudflare Tunnel authentifizieren:"
+echo "   cloudflared tunnel login"
+echo ""
+echo "2. Tunnel erstellen:"
+echo "   cloudflared tunnel create mana-server"
+echo ""
+echo "3. Dann melde dich bei Till/Claude für die nächsten Schritte!"
+echo ""