Remove DynamoDB setup and caching logic

feat: add clickable action buttons and improve AI UX

Add Windows PowerShell script (dev.ps1) for Windows users

Remove architecture section from README

Fix: Display actual card last4 instead of hardcoded 4242

Fix: Preserve checkout state on payment errors, better error categorization

Fix checkout hints: Module 3 -> Module 4 (correct module for Merchant Service)

Fix TODO error message references: Module 3, Chapter 3 -> Chapter 5

Merge branch 'fix/tester-feedback-batch2'

Merge pull request #4 from benjasl-stripe/hide-stripe-pk-input

Hide Stripe publishable key input in ConfigModal

Fix #7: Correct module references in TODO error messages

Fix #4: Empty skis.json for workshop users to fill

Merge pull request #3 from benjasl-stripe/fix/UI-chat-savedPM

fix: Profil Setup order, remove dummy profil update message