Fix ansible-lint violations: FQCN, formatting, bugs, role renames

- Auto-fix FQCN, YAML formatting, jinja spacing, and free-form module
  syntax via ansible-lint --fix
- Fix comments misplaced inside module args by the auto-fixer
  (bluetooth-monitor, pi_standard_setup, pi_musicmouse)
- Fix notify: references left stale (lowercase) after handler names
  were re-cased, which would have silently broken reboot/restart
  handlers (pi_disable_onboard_bluetooth, pi_hifiberry_amp,
  pi_squeezelite, pi_standard_setup)
- Fix a task in pis/debmatic-install.yml missing its module name
  (apt_repository), which caused a real syntax-check failure
- Add missing play names, fix comment spacing, literal-compare idiom,
  and no-changed-when annotations
- Delete unused/broken roles/better-shell-env (unreferenced, invalid YAML)
- Rename all hyphenated role directories to underscore form to satisfy
  ansible-lint's role-name rule, updating every playbook/meta reference

Remaining lint findings (var-naming, package-latest, risky-file-permissions,
no-handler) intentionally left for follow-up per user decision.

inventory.yml

@@ -1,10 +1,10 @@
+---
 all:
   hosts:
     server:
       ansible_host: home.bauer.tech
       ansible_port: 22187
     server2:
-      
   children:
     iot:
       hosts:
@@ -33,7 +33,7 @@ all:
         esszimmerradio: # oben, eltern
           squeezelite_name: Esszimmer
           shairport_name: _Oben_Esszimmer
-          #alsa_card_name: Device
+          # alsa_card_name: Device
           squeezeserver: 192.168.178.100
           configure_wifi: true
           alsa_card_name: 1
@@ -49,7 +49,7 @@ all:
         musicmouse:
           squeezelite_name: MusicMouse
           shairport_name: MusicMouse
-          alsa_card_name: sndrpihifiberry 
+          alsa_card_name: sndrpihifiberry
           hifiberry_overlay: hifiberry-dacplus
           sensor_room_name: Kinderzimmer
           sensor_room_name_ascii: kinderzimmer
@@ -60,7 +60,7 @@ all:
           alsa_card_name: 0
           sensor_room_name_ascii: testraum
           sensor_room_name: Test Raum
-        heatingpi:          
+        heatingpi:
         server:
           sensor_room_name: Arbeitszimmer
           sensor_room_name_ascii: arbeitszimmer
@@ -76,7 +76,8 @@ all:
     squeezeserver: 192.168.178.80
     router_ip: 192.168.178.1
     home_assistant_url: https://ha.bauer.tech
-    home_assistant_token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJkM2QxYjAwYjkxZjY0MWVhYjA4YmZhMDYwYTg3YjRhNyIsImlhdCI6MTcwNDI3MDU5MSwiZXhwIjoyMDE5NjMwNTkxfQ.dzvejgEQd9hf-Yftzd7NkR5pv76GaLFczeOy-a2pa1o
+    home_assistant_token:
+      eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJkM2QxYjAwYjkxZjY0MWVhYjA4YmZhMDYwYTg3YjRhNyIsImlhdCI6MTcwNDI3MDU5MSwiZXhwIjoyMDE5NjMwNTkxfQ.dzvejgEQd9hf-Yftzd7NkR5pv76GaLFczeOy-a2pa1o
     configure_wifi: false
     wifi_ssid: BauerWLAN
     my_btmonitor_mqtt_username: my_btmonitor