feat(#64): Improve the about page

supabase/migrations/20260110120000_create_stats_cache.sql

@@ -0,0 +1,22 @@
+-- Create stats_cache table to store cached statistics
+-- This table will be updated once per day to improve performance
+
+CREATE TABLE stats_cache (
+  id BIGSERIAL PRIMARY KEY,
+  pokemon_caught BIGINT NOT NULL DEFAULT 0,
+  total_users BIGINT NOT NULL DEFAULT 0,
+  completed_pokedexes BIGINT NOT NULL DEFAULT 0,
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Create index for faster lookups
+CREATE INDEX idx_stats_cache_updated_at ON stats_cache(updated_at DESC);
+
+-- Enable RLS
+ALTER TABLE stats_cache ENABLE ROW LEVEL SECURITY;
+
+-- RLS policies: Only allow reads (stats are public)
+CREATE POLICY "Anyone can view stats cache" ON stats_cache
+  FOR SELECT USING (true);
+
+-- No insert/update/delete policies - only database functions can modify this table