Rebuild CityCorners from a Konstanz-only guide into a user-generated
platform for any city/village. Users can now create cities and add
locations within them, growing the platform organically.
- Add cities collection (name, slug, country, state, coordinates)
- Add cityId FK to locations, scope locations to cities
- New URL structure: /cities/[slug], /cities/[slug]/map, etc.
- Home page becomes city discovery with search
- Add city creation page with geocoding + slug generation
- Context-aware navigation (global vs city mode)
- Remove all Konstanz-specific hardcoding from i18n and map
- Guest seed with 3 example cities (Konstanz, Zürich, Berlin)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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