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>

scripts/init-db.sql

@@ -1,8 +1,8 @@
--- Padel Pro Database Initialization
+-- SmashPoint Database Initialization
 -- This script runs when PostgreSQL container starts for the first time
 
 -- Enable UUID extension if needed
 CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
 
 -- Grant privileges
-GRANT ALL PRIVILEGES ON DATABASE padel_pro TO padel;
+GRANT ALL PRIVILEGES ON DATABASE smashpoint_db TO padel;