feat(subscription): rename permit→subscription + monthly pricing

The "permit/lejet" feature is really a subscription. Full rename of the
mutable master data, plus a recurring monthly price.

- DB (migration 0004, data-preserving ALTER RENAME): permits→subscriptions,
  permit_credentials/_plates→subscription_*, sessions.permit_id→subscription_id.
- Pricing: per-subscription priceMinor + period(monthly) + currency, with a
  site default (site_config.subscription_monthly_price_minor) pre-filling the form.
- Server: subscription-flow.ts (SubscriptionFlow), routes/subscriptions.ts
  (/api/subscriptions). Web: SubscriptionManager, route, i18n (sq Abonimet/en).
- The signed ledger `permitId` payload is intentionally kept — immutable
  hash-chained history; renaming it would break verification of past events.

Deferred (wiki notes): fee collection into the ledger/shift (a shift-attributed
payment), LPR/ANPR plate source, time-of-day access windows (overnight subscriber).

Also carries the device-footer UI surface (api DeviceStatus, router mount,
i18n devices) due to shared-file overlap with the preceding footer commit.

Verified end-to-end on a fresh DB and migration on a live-DB copy (sessions
preserved). Live DB migrated. Full monorepo builds clean.

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

apps/server/src/read-dispatch.ts

@@ -2,32 +2,32 @@ import { devices, eq, type Db } from "@parking/db";
 import type { FastifyBaseLogger } from "fastify";
 import type { DeviceReadEvent, ReadOutcome } from "./device-events.js";
 import type { ExitFlow } from "./exit-flow.js";
-import type { PermitFlow } from "./permit-flow.js";
+import type { SubscriptionFlow } from "./subscription-flow.js";
 import { relayForDevice } from "./device-resolve.js";
 
 // Routes a credential read (ticket scan / plate / card) to the right flow. A read
-// can mean a permit entry/exit OR a transient exit, so we dispatch by WHAT the
+// can mean a subscription entry/exit OR a transient exit, so we dispatch by WHAT the
 // credential is (decision 2026-06-15):
-//   - matches a permit (card/QR/bound plate) → PERMIT flow,
+//   - matches a subscription (card/QR/bound plate) → SUBSCRIPTION flow,
 //   - else → transient EXIT flow (open ticket session → exit, else reject+log).
 //
 // The reader is BOUND to a controller relay (config.controllerId + relay), so a read
 // resolves to exactly the barrier it sits at, and the direction is inherited from
 // that relay (see entry-exit-points.md). The resolved relay is handed to the flow so
 // it opens that exact barrier. An "entry" reader drives the entry side, an "exit"
-// reader the exit side; "both" defers to the flow's own inference (permit: session
-// state; transient: exit).
+// reader the exit side; "both" defers to the flow's own inference (subscription:
+// session state; transient: exit).
 
 export class ReadDispatcher {
   readonly #db: Db;
   readonly #exit: ExitFlow;
-  readonly #permit: PermitFlow;
+  readonly #subscription: SubscriptionFlow;
   readonly #logger: FastifyBaseLogger;
 
-  constructor(db: Db, exit: ExitFlow, permit: PermitFlow, logger: FastifyBaseLogger) {
+  constructor(db: Db, exit: ExitFlow, subscription: SubscriptionFlow, logger: FastifyBaseLogger) {
     this.#db = db;
     this.#exit = exit;
-    this.#permit = permit;
+    this.#subscription = subscription;
     this.#logger = logger;
   }
 
@@ -41,13 +41,13 @@ export class ReadDispatcher {
       return { accepted: false, reason: "reader not bound to a barrier (no relay to open)" };
     }
 
-    const permit = this.#permit.match(e);
-    if (permit) {
-      return this.#permit.run(resolved, e, permit);
+    const sub = this.#subscription.match(e);
+    if (sub) {
+      return this.#subscription.run(resolved, e, sub);
     }
-    // Not a permit → transient ticket exit. An ENTRY reader can't produce a transient
-    // exit (transient entry is the button flow, not a reader), so reject+log rather
-    // than treat an entry scan as an exit.
+    // Not a subscription → transient ticket exit. An ENTRY reader can't produce a
+    // transient exit (transient entry is the button flow, not a reader), so reject+log
+    // rather than treat an entry scan as an exit.
     if (resolved.direction === "entry") {
       return { accepted: false, direction: "entry", reason: "entry reader: no transient entry via reader" };
     }