feat: add Docker health-state HTTP endpoint for Swarm Health Watchdog

- Python HTTP server on 0.0.0.0:18809
- GET /health -> all monitored containers (JSON)
- GET /health/<name> -> single container
- Monitors: brave-search, kokoro-tts, litellm, litellm-db, n8n-agent, searxng, whisper-server
- Returns status, health, restart count via docker inspect
- systemd user service for auto-start

Task: t_461f71fe

ansible/host_vars/zap.yml

@@ -4,8 +4,8 @@
 # ── VM provisioning ────────────────────────────────────────────────────────
 vm_domain: "zap [claw]"
 vm_hostname: zap
-vm_memory_mib: 3072
-vm_vcpus: 2
+vm_memory_mib: 4096
+vm_vcpus: 4
 vm_disk_path: /var/lib/libvirt/images/claw.qcow2
 vm_disk_size: "60G"
 vm_mac: "52:54:00:01:00:71"