Ops: add Proxmox migration tooling and runbook

Add end-to-end migration scripts for inventory, precopy, cutover, smoke tests, rollback, and post-migration checks. Include an operational runbook and Proxmox env template to move Hördle behind Nginx Proxy Manager while preserving persistent volumes safely.

scripts/migration-smoke-test.sh

@@ -0,0 +1,65 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Smoke-Tests nach dem Umschalten auf Proxmox/NPM.
+# Kann lokal oder auf beliebigem Host mit curl ausgefuehrt werden.
+
+BASE_URL="${1:-https://hoerdle.de}"
+EXPECTED_STATUS="${EXPECTED_STATUS:-200}"
+
+require_cmd() {
+  if ! command -v "$1" >/dev/null 2>&1; then
+    echo "Fehlend: $1"
+    exit 1
+  fi
+}
+
+require_cmd curl
+require_cmd grep
+
+echo "== Hördle Smoke-Test =="
+echo "BASE_URL=$BASE_URL"
+echo
+
+check_http() {
+  local name="$1"
+  local url="$2"
+  local code
+
+  code="$(curl -sS -o /dev/null -w "%{http_code}" "$url" || true)"
+  if [ "$code" = "$EXPECTED_STATUS" ]; then
+    echo "[OK] $name -> $code"
+  else
+    echo "[FAIL] $name -> $code (erwartet: $EXPECTED_STATUS)"
+    return 1
+  fi
+}
+
+check_body_contains() {
+  local name="$1"
+  local url="$2"
+  local needle="$3"
+
+  if curl -fsS "$url" | grep -q "$needle"; then
+    echo "[OK] $name enthält '$needle'"
+  else
+    echo "[FAIL] $name enthält '$needle' nicht"
+    return 1
+  fi
+}
+
+FAILED=0
+
+check_http "Homepage" "$BASE_URL/" || FAILED=1
+check_http "Daily API" "$BASE_URL/api/daily" || FAILED=1
+
+# Prüft, ob Daily API als JSON zurückkommt.
+check_body_contains "Daily API" "$BASE_URL/api/daily" "{" || FAILED=1
+
+echo
+if [ "$FAILED" -eq 0 ]; then
+  echo "Smoke-Test erfolgreich."
+else
+  echo "Smoke-Test fehlgeschlagen."
+  exit 1
+fi