Add .env.example template

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,14 @@
+# Supabase
+SUPABASE_PUBLISHABLE_KEY="your-supabase-publishable-key"
+SUPABASE_URL="https://your-project-id.supabase.co"
+VITE_SUPABASE_PROJECT_ID="your-project-id"
+VITE_SUPABASE_PUBLISHABLE_KEY="your-supabase-publishable-key"
+VITE_SUPABASE_URL="https://your-project-id.supabase.co"
+
+# AI bill parsing — get your key at https://console.anthropic.com/settings/keys
+ANTHROPIC_API_KEY="sk-ant-..."
+
+# Plaid — https://dashboard.plaid.com/developers/keys
+PLAID_CLIENT_ID="your-plaid-client-id"
+PLAID_SECRET="your-plaid-secret"
+PLAID_ENV="sandbox"