Overhaul help system UX with navi, recipes, and onboarding

- Rewrite fhelp: add 'start' onboarding, recipe fallback chain
  (our files → cheat → tldr), 'workflow' dynamic loader, tier badges
- Add welcome.sh: unified English welcome for bash/zsh/fish
- Replace German README with concise English version
- Add Zsh F1/Ctrl+/ widget for inline help while typing
- Configure navi Ctrl+G widget for interactive cheatsheet browsing
- Fix dangerous 'alias help=fhelp' (was breaking bash builtin)
- Add 'h' and 'analyse' as safe aliases

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

files/README

@@ -1,11 +1,12 @@
-README - pdfanalysis
-Dieser Container enthält Tools um PDFs zu analysieren:
+REMnux Malware Analysis Container
+===================================
+397 analysis tools | 8 workflows | Fully offline help
 
-pdfid.py - Schnelle Übersicht über PDF-Aufbau.
-pdf-parser.py - Zerlegen und extrahieren von PDF-Elementen
-peepdf.py - PDF - Analyse Framework mit Javascript Analyse
-pdftk - Tool um das PDF zu "flatten"
-convert - ImageMagick Tool zum convertieren
+  fhelp                  - Help system overview
+  fhelp start            - Quick start guide (30 sec)
+  fhelp tools <keyword>  - Search for tools
+  fhelp cheat <tool>     - Usage examples for a tool
+  fhelp workflow          - Step-by-step analysis workflows
+  Ctrl+G                 - Interactive cheatsheet browser
 
-Für Kommandobeispiele /opt/command_help lesen.
-Der Nutzer innerhalb des Containers braucht Schreibrechte auf das gemountete Verzeichnis.
+For mounted files: /work/ (or your mounted directory)