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/server_exthdd_mount/README.md

@@ -0,0 +1,4 @@
+# server_exthdd_mount
+
+Sets up systemd automount units and udev rules for external hard drives
+(`passport4`, `passport5`).

roles/server_exthdd_mount/files/99-automounts.rules

@@ -0,0 +1,2 @@
+ACTION=="add", SUBSYSTEM=="block", ENV{DEVLINKS}=="*/dev/disk/by-label/MartinsPassport4*", ENV{SYSTEMD_WANTS}="media-passport4.mount"
+ACTION=="add", SUBSYSTEM=="block", ENV{DEVLINKS}=="*/dev/disk/by-label/MartinsPassport5*", ENV{SYSTEMD_WANTS}="media-passport5.mount"

roles/server_exthdd_mount/files/media-passport4.mount

@@ -0,0 +1,12 @@
+[Unit]
+Description=Mount /dev/disk/by-label/MartinsPassport4 at /media/passport4
+Before=local-fs.target
+
+[Mount]
+What=/dev/disk/by-label/MartinsPassport4
+Where=/media/passport4
+Type=btrfs
+Options=noauto,nofail
+
+[Install]
+WantedBy=local-fs.target        

roles/server_exthdd_mount/files/media-passport5.mount

@@ -0,0 +1,12 @@
+[Unit]
+Description=Mount /dev/disk/by-label/MartinsPassport5 at /media/passport5
+Before=local-fs.target
+
+[Mount]
+What=/dev/disk/by-label/MartinsPassport5
+Where=/media/passport5
+Type=btrfs
+Options=noauto,nofail
+
+[Install]
+WantedBy=local-fs.target        

roles/server_exthdd_mount/tasks/main.yml

@@ -0,0 +1,20 @@
+---
+- name: Automount passport4 systemd file
+  ansible.builtin.copy:
+    src: media-passport4.mount
+    dest: /etc/systemd/system
+- name: Automount passport5 systemd file
+  ansible.builtin.copy:
+    src: media-passport5.mount
+    dest: /etc/systemd/system
+- name: Create udev rules
+  ansible.builtin.copy:
+    src: 99-automounts.rules
+    dest: /etc/udev/rules.d
+- name: Systemd reread configs
+  ansible.builtin.systemd:
+    daemon_reload: true
+- name: Reload udev
+  ansible.builtin.command:
+    cmd: "udevadm control --reload"
+  changed_when: true