feat(dominium): backend GPUI + app — ventana viva del simulador

dominium-canvas-gpui: Element que pinta un RenderPlan como quads,
centrado en sus bounds (rgba→hsla, único crate que toca gpui).

app dominium: compone core→physics→iso→render-plan→canvas en una
ventana GPUI con bucle de simulación de fondo (~11 tps), panel de
estadísticas, controles play/pausa + re-sembrar, y re-siembra
automática al colapso poblacional.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Cargo.toml

@@ -149,6 +149,7 @@ members = [
     "crates/modules/dominium/dominium-physics",
     "crates/modules/dominium/dominium-iso",
     "crates/modules/dominium/dominium-render-plan",
+    "crates/modules/dominium/dominium-canvas-gpui",
 
     # ============================================================
     # modules/gioser/ — Landing WASM (chacana + 4 elementos)
@@ -223,6 +224,7 @@ members = [
     "crates/apps/cosmobiologia",
     "crates/apps/cosmobiologia-cli",
     "crates/apps/cosmobiologia-server",
+    "crates/apps/dominium",
 ]
 
 [workspace.package]