feat: subscription plan catalog — config-defined pricing, dated spans, no typed amounts

Re-model subscription pricing from per-row, operator-typed prices into an
admin-composed, versioned PLAN CATALOG (the tariff pattern). The operator now
SELLS by picking a plan over a date span; the price is LOOKED UP, never typed —
removing the fat-finger risk on a money field — and day/week/month periods make
the hotel "guest stays 1–N days" case a daily plan over a check-in→check-out span.

- Schema/migration 0010: new `subscription_plans` (immutable, effective-dated,
  keyed by a stable planId; period day/week/month + per-period price + active
  flag). `subscriptions` gains planId/planVersionId; period enum widened. Seeds a
  "Monthly" plan from the existing site default price (no data loss).
- Pricing (pure, unit-tested in @parking/shared): periods = ceil(span / period),
  amount = periods × per-period price. Ceil = any started period is full (hotel
  practice). `resolvePlanVersion` picks the latest active version ≤ sale instant.
- Backend: new admin-only plan CRUD (`subscription:plan` permission); reworked
  sell path derives the amount from the plan; `POST /api/subscriptions/quote`
  returns a server-computed quote so the operator can't override it. The
  signed-payment sale fix is unchanged — only the amount SOURCE moved; payload
  now carries planId/planVersionId/periods. Updates never re-sell (price frozen).
- Frontend: SubscriptionManager sell form swaps the price field for a plan
  picker + start/end dates + a live quote line. New SubscriptionPlansManager
  (Setup tab) for the admin catalog. i18n (sq+en) for both.

Verified on a copy of the live DB: 0010 applies (existing subs intact), a
3-night hotel sale prices to 2,400 ALL, appends one signed payment with
planVersionId, chain verifies. Build+lint 12/12; 68 shared tests pass.

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

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

@@ -48,6 +48,7 @@ export const sq = {
     tariff: "Tarifa",
     tariffLab: "Lab Tarife",
     subscriptions: "Abonimet",
+    plans: "Planet",
     site: "Park",
     users: "Përdoruesit",
     roles: "Rolet",
@@ -393,9 +394,15 @@ export const sq = {
     cred: "kredencial",
     plates: "{{count}} targë(a)",
     noPrice: "pa çmim",
+    perDay: "ditë",
+    perWeek: "javë",
     perMonth: "muaj",
-    monthlyPrice: "Çmimi mujor",
-    pricePlaceholder: "p.sh. 10000",
+    plan: "Plani",
+    planNone: "— pa pagesë / falas —",
+    planNoneAvail: "Asnjë plan i përcaktuar — admini duhet të krijojë një të parin.",
+    quoting: "duke llogaritur…",
+    quotePrompt: "zgjidh datën e mbarimit",
+    quoteLine: "{{periods}} × {{unit}} · {{amount}} {{currency}}",
     tender: "Paguar me",
     tenderCash: "Para në dorë",
     tenderCard: "Kartë",
@@ -415,11 +422,7 @@ export const sq = {
     limitCarsInAtOnce: "kufizo makinat brenda njëkohësisht",
     validFrom: "Vlen nga",
     validTo: "Vlen deri",
-    months: "Muaj",
-    monthsHint: "muaj të paguar",
-    coverageHint: "deri më {{end}}",
-    totalDue: "gjithsej {{total}}",
-    validToOverride: "Vlen deri (manual)",
+    validToEnd: "Vlen deri (mbarimi)",
     isoDateOptional: "Datë ISO (opsionale)",
     boundPlates: "Targat e lidhura",
     commaSeparatedOptional: "të ndara me presje (opsionale)",
@@ -452,6 +455,29 @@ export const sq = {
     statusSuspended: "pezulluar",
     statusRevoked: "anuluar",
   },
+  plans: {
+    title: "Planet e abonimit",
+    intro: "Planet i përcakton admini; operatori vetëm shet prej tyre — çmimi merret automatikisht, nuk shkruhet. Ndryshimi i një plani publikon një version të ri; shitjet e mëparshme ruajnë çmimin e tyre.",
+    add: "+ Shto plan",
+    noneYet: "Asnjë plan ende. Shto një që kabina të shesë abonime.",
+    colName: "Emri",
+    colPrice: "Çmimi",
+    colEffective: "Vlen nga",
+    inForce: "në fuqi",
+    retired: "i tërhequr",
+    newVersion: "Version i ri",
+    retire: "Tërhiq",
+    newTitle: "Plan i ri",
+    newVersionTitle: "Publiko version të ri",
+    newVersionHint: "Kjo publikon një version TË RI të planit — shitjet ekzistuese ruajnë çmimin origjinal.",
+    period: "Periudha",
+    pricePer: "Çmimi për periudhë",
+    namePlaceholder: "p.sh. Hotel ditor",
+    needName: "Emri i planit është i detyrueshëm.",
+    needPrice: "Shkruaj një çmim më të madh se zero.",
+    saved: "Plani u ruajt.",
+    confirmRetire: "Të tërhiqet plani “{{name}}”? Nuk do të jetë më i shitshëm (historiku ruhet).",
+  },
   site: {
     occupancy: "Prania:",
     noCapacitySet: "(pa kapacitet të caktuar)",
@@ -460,7 +486,7 @@ export const sq = {
     capacityLabel: "Kapaciteti (bosh = pa kufi):",
     capacityPlaceholder: "p.sh. 120",
     printExitDefault: "Printo biletën e daljes si parazgjedhje",
-    printExitHint: "(kabina larg daljes → klienti del vetë me biletë)",
+    printExitHint: "(klienti skanon biletën në dalje)",
     parkDetails: "Të dhënat e parkimit (opsionale — shfaqen në bileta/fatura)",
     save: "Ruaj",
     saved: "U ruajt.",