Rewrite README as current-state reference, drop changelog narrative
Removes all dated section headings (2026-07-24 through 2026-07-31) and inline dated asides, folding still-true facts into the evergreen structure (Pages, Cart & checkout, Orders & customer accounts, etc.). Also fixes references to app/lib/vies.ts/vatId.ts/tracking.ts, which moved into @einfach-produktiv/invoicing. Git history is the actual changelog. 2375 -> 1798 lines. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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