fix: record subscription sale as a signed payment (close off-book hole)

Creating a priced subscription wrote only the mutable `subscriptions`
master row and appended NOTHING to the signed ledger — so the cash an
operator collected showed in the live feed, drawer, and shift Z-report
nowhere, leaving no signed trace. A booth operator could sell
subscriptions and pocket the money untraceably — the exact
operator-as-adversary path the append-only signed ledger exists to close.
Found live: 3 priced subscriptions (27,000 ALL) had zero payment events.

Selling a priced subscription now appends a signed `payment` event at
create time: amount = priceMinor x months (full multi-month prepay),
operator-chosen tender (cash->drawer / card->bank), payload
{ subscriptionSale: true, permitId, operator, months }. Folds into the
shift Z-report/drawer with no new summing logic; the feed badges it
"subscription sale" and resolves the holder name. The create response
returns the recorded { sale }; subscriptionRoutes now takes the EventLog
and ShiftService.

Not hard-gated on an open shift (a sale can happen outside the booth money
path) — it warns instead. The 3 historical off-book sales are not
back-fillable (append-only forbids forging dated events) — reconcile via
cash_movement or a Z-report note.

Verified against a copy of the live DB with the real signing modules:
signed payment appended, hash-chain still verifies, lands in shift cash
totals. Build + lint 12/12.

Wiki: subscription "Collecting the fee" deferred -> BUILT (+ the off-book
hole and why); shift sale-folds-in; threat-model worked example
("store the price != account for the sale").

Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V

apps/web/src/lib/i18n/sq.ts

@@ -157,6 +157,7 @@ export const sq = {
     badgeBarrierFailed: "barriera nuk u hap",
     badgeManualOpen: "hapje manuale",
     badgeSubRefused: "abonimi u refuzua",
+    badgeSubSale: "shitje abonimi",
     badgeNoTicket: "bileta nuk u printua",
     feedSourceBooth: "kabinë",
     feedSourceReader: "lexues",
@@ -393,6 +394,12 @@ export const sq = {
     perMonth: "muaj",
     monthlyPrice: "Çmimi mujor",
     pricePlaceholder: "p.sh. 10000",
+    tender: "Paguar me",
+    tenderCash: "Para në dorë",
+    tenderCard: "Kartë",
+    tenderHint: "Regjistrohet si pagesë e nënshkruar (aktiviteti, arka, raporti i turnit).",
+    saleRecorded: "Shitja u regjistrua: {{amount}} {{currency}} ({{tender}}).",
+    saleNoShift: "⚠ Asnjë turn i hapur — hapni një që arkëtimi të hyjë në një raport turni.",
     edit: "Ndrysho",
     revoke: "Anulo",
     delete: "Fshij",
@@ -531,7 +538,7 @@ export const sq = {
     cashTaken: "Para të marra:",
     cashAdded: "Para të shtuara:",
     cashRemoved: "Para të hequra:",
-    expectedDrawer: "Arka e pritshme:",
+    expectedDrawer: "Gjëndje Arke:",
     printedToReceipt: "Printuar te printeri i kabinës.",
     recordedNoPrinter: "Regjistruar (pa printer për të printuar).",
     // Header shift control + the booth shift gate.
@@ -559,7 +566,7 @@ export const sq = {
     payments: "Pagesa",
     cash: "Para",
     card: "Kartë",
-    expectedDrawer: "Arka e pritshme",
+    expectedDrawer: "Gjëndje arke",
     // Filter (admin only).
     filterFrom: "Nga",
     filterTo: "Deri",