capture overseerr, syncthing, and fix slskd on london-b

Add Overseerr (snap) and Syncthing (apt) to media_stack role so they're
managed by Ansible instead of being manually installed.

- Overseerr: snap install from latest/beta channel (matches current)
- Syncthing: apt install, enable syncthing@pez systemd user service
- slskd: remove stale 'currently stopped' comment from compose file
- london-b host_vars: document snap and apt user services

Fixes PESO-106

ansible/inventory/host_vars/london-b.yml

@@ -12,6 +12,14 @@ docker_services:
   - smartctl-exporter
   - plex-exporter
 
+# Snap-managed services (deployed by media_stack role)
+snap_services:
+  - overseerr
+
+# APT-managed user services (deployed by media_stack role)
+apt_user_services:
+  - syncthing@pez
+
 zfs_pools:
   - hdd
 

ansible/roles/media_stack/tasks/main.yml

@@ -55,6 +55,32 @@
     - vsftpd
     - cloudflared
 
+# ── Snap packages ──
+
+- name: Install Overseerr via snap
+  community.general.snap:
+    name: overseerr
+    channel: latest/beta
+    state: present
+
+- name: Ensure Overseerr snap service is running
+  ansible.builtin.command: snap start overseerr
+  changed_when: false
+  failed_when: false
+
+# ── APT-managed services ──
+
+- name: Install Syncthing
+  ansible.builtin.apt:
+    name: syncthing
+    state: present
+
+- name: Enable and start Syncthing for pez user
+  ansible.builtin.systemd:
+    name: syncthing@pez
+    state: started
+    enabled: true
+
 # ── Configuration files ──
 
 - name: Deploy promtail config

ansible/services/slskd/docker-compose.yml

@@ -2,7 +2,6 @@
 # slskd - Soulseek client (web UI)
 # Host: london-b (100.84.65.101)
 # Data: /root/slskd (app), /hdd/music/slskd (downloads)
-# Status: Currently stopped (not set to auto-restart)
 
 services:
   slskd: