refactor(bootstrap): standardize patterns, extract common logic, remove dead code

- Make timezone, locale, and keymap configurable via system_cfg
- Consolidate rhel8/9/10.repo.j2 into single rhel.repo.j2 template
- Extract bootstrap_common_conditional for shared firewall/LUKS/guest packages
- Remove redundant version aliases (fedora40-43, debian10-13, rhel8-10, etc.)
- Simplify bootstrap dispatch from 10 conditional blocks to single mapping
- Merge bootstrap_ubuntu_lts into bootstrap_ubuntu (identical)
- Remove orphaned firstrun.sh.j2 template
- Remove configuration/defaults/main.yml aliases, inline into banner.yml
- Remove unnecessary changed_when: false on set_fact/debug tasks
- Deduplicate hostname variable computation in locales.yml
- Update README with timezone/locale/keymap variable reference

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

roles/bootstrap/tasks/main.yml

@@ -1,45 +1,17 @@
 ---
 - name: Run OS-specific bootstrap process
   vars:
-    bootstrap_os_key: "{{ (os_resolved | default(os)) | lower }}"
-    bootstrap_var_key: "{{ 'bootstrap_' + ((os_resolved | default(os)) | lower | replace('-', '_')) }}"
-  block:
-    - name: Include AlmaLinux bootstrap tasks
-      when: bootstrap_os_key in ['almalinux', 'almalinux8', 'almalinux9', 'almalinux10']
-      ansible.builtin.include_tasks: almalinux.yml
-
-    - name: Include Alpine bootstrap tasks
-      when: bootstrap_os_key == 'alpine'
-      ansible.builtin.include_tasks: alpine.yml
-
-    - name: Include ArchLinux bootstrap tasks
-      when: bootstrap_os_key == 'archlinux'
-      ansible.builtin.include_tasks: archlinux.yml
-
-    - name: Include Debian bootstrap tasks
-      when: bootstrap_os_key in ['debian10', 'debian11', 'debian12', 'debian13', 'debianunstable']
-      ansible.builtin.include_tasks: debian.yml
-
-    - name: Include Fedora bootstrap tasks
-      when: bootstrap_os_key in ['fedora', 'fedora40', 'fedora41', 'fedora42', 'fedora43']
-      ansible.builtin.include_tasks: fedora.yml
-
-    - name: Include openSUSE bootstrap tasks
-      when: bootstrap_os_key == 'opensuse'
-      ansible.builtin.include_tasks: opensuse.yml
-
-    - name: Include Rocky bootstrap tasks
-      when: bootstrap_os_key in ['rocky', 'rocky8', 'rocky9', 'rocky10']
-      ansible.builtin.include_tasks: rocky.yml
-
-    - name: Include RHEL bootstrap tasks
-      when: bootstrap_os_key in ['rhel8', 'rhel9', 'rhel10']
-      ansible.builtin.include_tasks: rhel.yml
-
-    - name: Include Ubuntu bootstrap tasks
-      when: bootstrap_os_key in ['ubuntu', 'ubuntu-lts']
-      ansible.builtin.include_tasks: ubuntu.yml
-
-    - name: Include Void bootstrap tasks
-      when: bootstrap_os_key == 'void'
-      ansible.builtin.include_tasks: void.yml
+    bootstrap_os_task_map:
+      almalinux: almalinux.yml
+      alpine: alpine.yml
+      archlinux: archlinux.yml
+      debian: debian.yml
+      fedora: fedora.yml
+      opensuse: opensuse.yml
+      rocky: rocky.yml
+      rhel: rhel.yml
+      ubuntu: ubuntu.yml
+      ubuntu-lts: ubuntu.yml
+      void: void.yml
+    bootstrap_var_key: "{{ 'bootstrap_' + (os | replace('-lts', '') | replace('-', '_')) }}"
+  ansible.builtin.include_tasks: "{{ bootstrap_os_task_map[os] }}"