Sergio Valor 00a5875c92 feat(gpu): migrar a SDL3_GPU amb 2-pass rendering i post-processat ...

- Infraestructura GPU: GpuContext, GpuPipeline, GpuSpriteBatch, GpuTexture
- Engine::render() migrat a 2-pass: sprites → offscreen R8G8B8A8 → swapchain + vignette
- UI/text via software renderer (SDL3_ttf) + upload com a textura overlay GPU
- CMakeLists.txt actualitzat per incloure subsistema gpu/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-19 22:08:12 +01:00

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