Sync infra config: HA/Zabbix relocation, Immich storage move, new services

Accumulated uncommitted infra changes:
- Caddyfile: repoint HA/Zabbix to 192.168.1.4/.3, add ~20 new site routes
- Immich: move media to /mnt/smsg, enable CUDA ML, mem limits, rewrite backup.sh
- Add service stacks: agap-mcp, anki, family, freshrss, iperf3, kanboard,
  linkwarden, qbittorrent, radicale, syncthing, vikunja, windows
- openwebui: enable API keys; ollama: drop CPU fallback
- seafile/zabbix: extra_hosts entries; matrix: add user juris
- Remove pihole stack and stale wiki/migrate.py
- Ignore marketplace-mcp (standalone repo) and linkwarden runtime data

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LeqyaxJF2nbRXJtae2kNB2

kanboard/docker-compose.yml

@@ -0,0 +1,17 @@
+name: kanboard
+services:
+  app:
+    image: kanboard/kanboard:latest
+    container_name: kanboard
+    restart: always
+    ports:
+      - "127.0.0.1:4800:80"
+    volumes:
+      - data:/var/www/app/data
+      - plugins:/var/www/app/plugins
+    environment:
+      - PLUGIN_INSTALLER=true
+
+volumes:
+  data:
+  plugins: