feat(api): add public business info route and TotalVATCollected to daily summary

Expose GET /business-info public endpoint for non-admin users. Add TotalVATCollected field to DailySummary and compute it in the aggregate query.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

backend/handlers/today/today.go

@@ -50,6 +50,7 @@ type ServiceBookingCount struct {
 type DailySummary struct {
 	TotalPaymentsToday float64               `json:"total_payments_today"`
 	TotalTipsToday     float64               `json:"total_tips_today"`
+	TotalVATCollected  float64               `json:"total_vat_collected,omitempty"`
 	AmountDueToday     float64               `json:"amount_due_today"`
 	TotalDurationSpent int                   `json:"total_duration_spent"`
 	CustomersServed    int                   `json:"customers_served"`
@@ -240,6 +241,7 @@ func computeAggregateSummary(r *http.Request, rangeStart, rangeEnd time.Time) *D
 		SELECT
 			COALESCE(SUM(p.amount) FILTER (WHERE p.status = 'completed' AND p.payment_type != 'tip'), 0) AS total_payments,
 			COALESCE(SUM(p.amount) FILTER (WHERE p.status = 'completed' AND p.payment_type = 'tip'), 0) AS total_tips,
+			COALESCE(SUM(p.vat_amount) FILTER (WHERE p.status = 'completed' AND p.payment_type != 'tip'), 0) AS total_vat,
 			COALESCE(SUM(sub.amount_due) FILTER (WHERE sub.amount_due > 0), 0) AS amount_due,
 			COALESCE(SUM(sub.duration_minutes), 0) AS total_duration,
 			COUNT(DISTINCT b.id) FILTER (WHERE b.status NOT IN ('client_cancelled','we_cancelled','no_show','deposit_lapsed')) AS total_bookings,
@@ -292,6 +294,7 @@ func computeAggregateSummary(r *http.Request, rangeStart, rangeEnd time.Time) *D
 	_ = db.Conn.QueryRow(r.Context(), query, rangeStart, rangeEnd).Scan(
 		&summary.TotalPaymentsToday,
 		&summary.TotalTipsToday,
+		&summary.TotalVATCollected,
 		&summary.AmountDueToday,
 		&summary.TotalDurationSpent,
 		&summary.TotalBookings,

backend/main.go

@@ -207,6 +207,9 @@ func main() {
 		// Public contact info
 		r.Get("/contact", user.GetContactInfoHandler)
 
+		// Public business info (limited, safe for non-admin users)
+		r.Get("/business-info", admin.GetPublicBusinessInfo)
+
 		// Portfolio
 		r.Route("/portfolio", func(r chi.Router) {
 			r.Get("/images", portfolio.ListImages)