donation item, shop soft open

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

server/interfaces/Catcrafts.Server.cppm

@@ -64,6 +64,13 @@ export namespace Catcrafts::Server {
         std::int64_t shippingMinor = 0;
         std::int64_t totalMinor = 0;
         bool vatIncluded = false;
+        // A donation: buyer-named amount, nothing ships, no VAT, and — the
+        // consequences downstream — no invoice number is ever assigned, the
+        // mailer sends a thank-you without an attachment (or nothing, when no
+        // email was given), and /financials counts it under donations rather
+        // than sales. Additive ledger key: absent reads false, so every order
+        // written before donations existed stays a sale.
+        bool donation = false;
         std::string status = "awaiting_payment";  // -> paid -> shipped | cancelled
         std::string payChoice;       // Form::kPayBank | Form::kPayCrypto; which
                                      // rail issued the link, and so which one
@@ -118,11 +125,15 @@ export namespace Catcrafts::Server {
     //
     // /financials shows lifetime sales as two integers: how many orders were
     // ever paid, and what they summed to. Ever-paid on purpose — a refund is
-    // an expense on that page, it does not un-happen the sale. Pure and
-    // exported for the self-test.
+    // an expense on that page, it does not un-happen the sale. Donations paid
+    // through the shop land in the same ledger but are NOT sales — they fold
+    // into their own pair here and join the bank-side donations on the page.
+    // Pure and exported for the self-test.
     struct SalesSummary {
         std::int64_t count = 0;
         std::int64_t totalMinor = 0;
+        std::int64_t donationCount = 0;
+        std::int64_t donationsMinor = 0;
     };
     SalesSummary SummarizeSales(std::span<const OrderRecord> orders);