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_shairport/tasks/main.yml

@@ -0,0 +1,43 @@
+---
+- name: Apt install dependencies
+  ansible.builtin.apt:
+    cache_valid_time: 7200
+    state: present
+    name:
+      - build-essential
+      - git
+      - xmltoman
+      - autoconf
+      - automake
+      - libtool
+      - libpopt-dev
+      - libconfig-dev
+      - libasound2-dev
+      - avahi-daemon
+      - libavahi-client-dev
+      - libssl-dev
+      - libsoxr-dev
+- name: Build and Install Shairport sync (may take a while)
+  ansible.builtin.script: "build-shairport-sync.sh ${shairport_sync_version}"
+  args:
+    creates: /usr/local/bin/shairport-sync
+- name: Copy config
+  ansible.builtin.template:
+    src: shairport-sync.conf
+    dest: /etc/shairport-sync.conf
+- name: Modify service file to run as root
+  ansible.builtin.lineinfile:
+    path: /lib/systemd/system/shairport-sync.service
+    regexp: "^#?User="
+    line: "User=root"
+- name: Restart shairport-sync
+  ansible.builtin.systemd:
+    name: shairport-sync
+    state: restarted
+    enabled: "yes"
+    daemon_reload: "yes"
+- name: Add to sysdweb
+  ansible.builtin.include_role:
+    name: pi_sysdweb
+  vars:
+    sysdweb_name: shairport-sync