feat: rebrand application from Padel Pro to SmashPoint

Complete rename across all layers: UI branding, package names
(@smashpoint/web, @smashpoint/shared), infrastructure (Docker,
DB config), seed data, documentation, and logo/favicon.

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

apps/web/app/icon.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32" fill="none">
+  <rect width="32" height="32" rx="8" fill="#F59E0B"/>
+  <path d="M17.5 3L6.5 17h8l-3 12L22.5 15H14.5l3-12z" fill="white"/>
+  <circle cx="25" cy="6" r="1.5" fill="white" opacity="0.8"/>
+  <circle cx="27" cy="9" r="1" fill="white" opacity="0.6"/>
+</svg>