chore(V2): branch V2.0.0 come default deploy (no merge in main)

deploy-vps.sh: BRANCH default V2.0.0 invece di main.
README: clone con -b V2.0.0, nota che il branch in produzione è V2.0.0.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/deploy-vps.sh

@@ -19,7 +19,7 @@
 #   ssh user@vps 'cd /opt/cerbero-mcp && bash scripts/deploy-vps.sh'
 #
 # Variabili env (opzionali):
-#   BRANCH                  ramo git da deployare (default: main)
+#   BRANCH                  ramo git da deployare (default: V2.0.0)
 #   SERVICE                 nome servizio docker compose (default: cerbero-mcp)
 #   PORT                    porta /health da pingare (default: dal .env, fallback 9000)
 #   HEALTH_TIMEOUT_SECONDS  attesa max health (default: 30)
@@ -30,7 +30,7 @@
 set -euo pipefail
 
 # ─── Config ──────────────────────────────────────────────────────────────
-BRANCH="${BRANCH:-main}"
+BRANCH="${BRANCH:-V2.0.0}"
 SERVICE="${SERVICE:-cerbero-mcp}"
 HEALTH_TIMEOUT_SECONDS="${HEALTH_TIMEOUT_SECONDS:-30}"
 HEALTH_INTERVAL="${HEALTH_INTERVAL:-2}"