feat: vollst. Installations-Doku, Ansible-Rollen ausimplementiert, claude_workspace-Rolle

- docs/installation.md: Netinstall + Dualboot Schritt-für-Schritt (LUKS nur am Notebook)
- docs/postinstall-ansible.md: Ablauf + restmanuelle Schritte
- roles/base: APT-Sources mit non-free-firmware + Backports, Locale, Tastatur, Zeitzone, Grundpakete
- roles/desktop_kde: Plasma 6 + SDDM (ohne Recommends, kompakt)
- roles/hardening: SSH key-only, UFW, unattended-upgrades
- roles/dev_tools: Node.js via NodeSource, Python, Perl, Git-Defaults
- roles/workstation_apps: Firefox, Thunderbird, LibreOffice, Codecs, KeePassXC
- roles/claude_workspace (NEU): Claude Code + ccusage, SSH-Key für Gitea, Workspace-Clone (recurse-submodules), ~/.claude/settings.json
- site.yml: alle Rollen mit Tags

ansible/roles/workstation_apps/tasks/main.yml

@@ -1,3 +1,16 @@
 ---
-# Browser, Office, Multimedia-Codecs
-# TODO: implementieren — Skeleton-Datei
+- name: Anwendungen (Browser, Office, Multimedia, Tools)
+  ansible.builtin.apt:
+    name:
+      - firefox-esr
+      - libreoffice
+      - libreoffice-l10n-de
+      - thunderbird
+      - thunderbird-l10n-de
+      - keepassxc
+      - vlc
+      - ffmpeg
+      - libavcodec-extra
+      - gimp
+      - inkscape
+    state: present