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>

packages/shared/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@padel-pro/shared",
+  "name": "@smashpoint/shared",
   "version": "0.1.0",
   "private": true,
   "main": "./src/index.ts",