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.

roles/pi_standard_setup/files/motd/bedroompi

@@ -0,0 +1,14 @@
+
+     WELCOME IN THE BEDROOM
+
+          !__________!
+          |____  ____|
+   _____  {____}{____}  _____
+ __|_*_|__%%%%%%%%%%%%__|_*_|
+   |   | %%%%%%%%%%%%%% |   |
+        %%%%%%%%%%%%%%%%
+       %%%%%%%%%%%%%%%%%%
+      %%%%%%%%%%%%%%%%%%%%
+     /||||||||||||||||||||\
+     ||||||||||||||||||||||
+

roles/pi_standard_setup/files/motd/esszimmerradio

@@ -0,0 +1,12 @@
+  EsszimmerRadio Eltern
+  
+       ________
+      /______  |
+     |       | |      _
+     | ===== | |     | |
+     | ===== | |    o o
+     |       | |         |~
+     |  .-.  | |       o    o o
+     | ' . ' | |   |~       |_|
+  ..'| '._.' | |  o
+.'   |_______|/ 

roles/pi_standard_setup/files/motd/kitchenpi

@@ -0,0 +1,18 @@
+
+          WELCOME IN THE KITCHEN
+
+                        ___
+                      .' _ '.
+                     / /` `\ \
+                     | |   [__]
+                     | |    {{
+                     | |    }}
+                  _  | |  _ {{
+      ___________<_>_| |_<_>}}________
+          .=======^=(___)=^={{====.
+         / .----------------}}---. \
+        / /                 {{    \ \
+       / /                  }}     \ \
+      (  '========================='  )
+       '-----------------------------'
+

roles/pi_standard_setup/files/motd/musicmouse

@@ -0,0 +1,7 @@
+     Music Mouse
+     
+          ___
+ _  _  .-'   '-.
+(.)(.)/         \   
+ /@@             ;
+o_\\-mm-......-mm`~~~~~~~~~~~~~~~~`

roles/pi_standard_setup/files/motd/musikserverwohnzimmeroben

@@ -0,0 +1,10 @@
+ 
+ Musik Server Wohnzimmer oben
+
+      |~~~~~~~~~~~~~~~|
+      |~~~~~~~~~~~~~~~|
+      |               |
+  /~~\|           /~~\|
+  \__/            \__/
+
+  

roles/pi_standard_setup/files/motd/newrpi

@@ -0,0 +1,4 @@
+
+THIS IS A NEW RASPI - CONFIGURE IT!
+
+

roles/pi_standard_setup/files/motd/octopi

@@ -0,0 +1,3 @@
+=================
+WELCOME TO OCTOPI
+=================