Phantom v2: dual-mode architecture, security hardening, deployment management

- Dual-mode operation: standalone + c2itall integrated (env var detection)
- SSH keys moved to ~/.ssh/c2deploy_ph-{id} with per-deployment known_hosts
- Ansible output streaming with filtered console + full log capture
- Deployment management menu: discover, SSH, teardown existing deployments
- Cert setup script (setup-cert.sh) deployed to servers for post-DNS LE certs
- Matrix hardening: unique secrets, SSRF protection, rate limits, nginx security headers
- Base hardening: fail2ban systemd backend (Debian 12), SSH limits, nginx jails
- Add-matrix-user helper script deployed to all Matrix servers
- .env support for standalone credential storage
- Config key rename: deploy_id → deployment_id (with backward compat)
- Provider cleanup playbooks for teardown
- Test suite with 50 tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

phantom/modules/vault.py

@@ -1,4 +1,4 @@
-"""Vaultwarden (Bitwarden) deployment module (stub — playbook TODO)."""
+"""Vaultwarden (Bitwarden-compatible) deployment module — binary + systemd + nginx."""
 
 import secrets
 
@@ -11,7 +11,7 @@ RESET = "\033[0m"
 def gather_config(config):
     """Gather Vaultwarden configuration."""
     print(f"\n{CYAN}  ┌─ Vaultwarden Configuration ───────────────────────┐{RESET}")
-    print(f"  {CYAN}│{RESET}  {GREY}Note: Playbook coming soon{RESET}")
+    print(f"  {CYAN}│{RESET}  {GREY}Pre-built binary + systemd + nginx{RESET}")
 
     config["domain"] = config.get("domain") or input(
         f"  {CYAN}│{RESET}  Domain (e.g. vault.example.com): "