Add complete Acai development documentation
- CLAUDE.md: expanded with critical rules, hook syntax, DB conventions, web-base endpoint
- docs/modular-system.md: modules, general sections, global vars, multiv2
- docs/builder-fields.md: all field types, c-if/c-for/c-class, c-form, built-in components
- docs/twig-filters.md: get, hook, module, queryDB, imagec, translate, raw, etc.
- docs/hooks-and-api.md: PHP hooks, CmsApi CRUD, table schemas, field formats
- docs/css-js-conventions.md: Tailwind, BEM, CSS vars, Vue 3 integration, CmsApi JS
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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