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_sysdweb/tasks/main.yml

@@ -0,0 +1,44 @@
+---
+- name: Apt install python3-pip
+  ansible.builtin.apt:
+    name: python3-pip
+    cache_valid_time: 7200
+    state: present
+- name: Install sysdweb
+  ansible.builtin.pip:
+    name: sysdweb
+    executable: pip3
+    extra_args: "--break-system-packages"
+- name: Sysdweb user
+  ansible.builtin.user:
+    name: sysdweb
+    shell: /usr/bin/nologin
+    password: "$6$TcTD23xOXln$RxN3Kd0vJRaxffoyKqjoBJM0Q5Va6REBVZ6BOgmGXs3fTAWc7voSW5QcN35t9pfro2do0LeSaeGsrMLbArZ.2."
+    update_password: always
+- name: Configure sysdweb user
+  ansible.builtin.blockinfile:
+    path: /etc/sysdweb.conf
+    create: true
+    marker: "# {mark} ansible user"
+    block: |
+      [DEFAULT]
+      users = sysdweb
+- name: Configure sysdweb
+  ansible.builtin.blockinfile:
+    path: /etc/sysdweb.conf
+    create: true
+    marker: "# {mark} ansible managed for {{ sysdweb_name }}"
+    block: |
+      [{{ sysdweb_name }}]
+      title = {{ sysdweb_name }}
+      unit = {{ sysdweb_name }}.service
+- name: Install systemd service file
+  ansible.builtin.copy:
+    src: sysdweb-system.service
+    dest: /etc/systemd/system/
+- name: Enable sysdweb autostart
+  ansible.builtin.systemd:
+    name: sysdweb-system
+    state: restarted
+    enabled: "yes"
+    daemon_reload: "yes"