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/playbooks/dns/main.yml

@@ -1,5 +1,5 @@
 ---
-# Pi-hole DNS server deployment (Docker-based)
+# Pi-hole DNS server deployment (native installer)
 
 - name: Deploy Pi-hole DNS Server
   hosts: all
@@ -16,3 +16,9 @@
 
     - name: Include Pi-hole configuration
       include_tasks: tasks/configure.yml
+
+  handlers:
+    - name: restart pihole-FTL
+      service:
+        name: pihole-FTL
+        state: restarted