feat: implementar 12 mejoras, tests, docs y optimizaciones
- Fase A: license templates, search history, cost estimator - Fase B: import URL, bulk ZIP, batch download - Fase C: comparison mode, mesh validation, measurement tool - Fase D: cross-section clipping, overhang heatmap, layer animation - Refactor Pydantic/SQLAlchemy warnings - 24 tests pytest - README actualizado - WebP thumbnails, lazy loading, cache headers
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