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/fish_config.fish

@@ -7,17 +7,13 @@ alias grep='grep --color=auto'
 alias fd='fdfind'
 alias rg='rg --color=auto'
 alias analyse='fhelp'
-alias ?='fhelp'
+alias h='fhelp'
 
-# Fish prompt - simple and clean
+# Fish prompt
 function fish_prompt
     set_color cyan
     echo -n 'remnux'
     set_color normal
-    echo -n '@'
-    set_color blue
-    echo -n (prompt_hostname)
-    set_color normal
     echo -n ':'
     set_color yellow
     echo -n (prompt_pwd)
@@ -25,10 +21,15 @@ function fish_prompt
     echo -n '> '
 end
 
-# Welcome message
-if test -f /opt/README
-    cat /opt/README
-    echo ""
-    echo "🐚 Shell: fish | Type 'fhelp' for help"
-    echo ""
-end
+# Navi widget (Ctrl+G)
+if command -q navi
+    navi widget fish | source 2>/dev/null
+end
+
+# Welcome message (only once per session)
+if not set -q _WELCOME_SHOWN
+    set -gx _WELCOME_SHOWN 1
+    if test -f /usr/local/bin/welcome.sh
+        bash /usr/local/bin/welcome.sh
+    end
+end