Add leads handlers, WhatsApp integration, and test files

apps/go-crm/internal/handlers/auth.go

@@ -200,12 +200,22 @@ func GetAccountID(r *http.Request) (int64, error) {
 func requireAuth(w http.ResponseWriter, r *http.Request) (int64, bool) {
 	accountID, err := getSession(r)
 	if err != nil {
-		http.Redirect(w, r, "/auth/login", http.StatusFound)
+		if isAPIRequest(r) {
+			w.Header().Set("Content-Type", "application/json")
+			w.Write([]byte(`{"error":"unauthorized"}`))
+		} else {
+			http.Redirect(w, r, "/auth/login", http.StatusFound)
+		}
 		return 0, false
 	}
 	return accountID, true
 }
 
+func isAPIRequest(r *http.Request) bool {
+	accept := r.Header.Get("Accept")
+	return accept == "application/json" || r.URL.Path == "/leads/qr"
+}
+
 func SetupAuthHandlers(db *sql.DB) {
 	DB = db
 	chi.RegisterMethod("GET")