Add full deck, config tool, and updated design docs
Adds the complete "KI verstehen" presentation (36 slides), the Präsentations-Konfigurator (config.html + slides-manifest.js) for curating which slides to show, and updates DESIGN.md/PATTERNS.md/ deck-template.html to reflect the new house font (General Sans) and newly established patterns (chapter dividers, term tooltips, the mitmach game, ambient sound, and the slide configurator).
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