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/bluetooth_monitor/tasks/main.yml

@@ -0,0 +1,33 @@
+---
+- name: Apt install bluez, firmware and Python requirements
+  ansible.builtin.apt:
+    name:
+      - bluez
+      - bluez-firmware
+      - firmware-realtek
+      - firmware-realtek-rtl8723cs-bt
+      - python3-pycryptodome
+      - python3-bleak
+      - python3-asyncio-mqtt
+      - python3-numpy
+- name: Copy monitor script
+  ansible.builtin.template:
+    src: my_btmonitor.py
+    dest: /usr/bin/my_btmonitor
+    owner: root
+    mode: u+rwx
+- name: Install systemd service file
+  ansible.builtin.copy:
+    src: my_btmonitor.service
+    dest: /etc/systemd/system/
+- name: Add script to autostart and start now
+  ansible.builtin.systemd:
+    name: my_btmonitor
+    state: restarted
+    enabled: "yes"
+    daemon_reload: "yes"
+# - name: Add to sysdweb
+#   include_role:
+#     name: pi_sysdweb
+#   vars:
+#     sysdweb_name: my_btmonitor