feat(auth): dynamic RBAC — composable roles + resource×CRUD permissions

Replace the hardcoded role enum (admin/operator/cashier/readonly, checked
literally as requireRole("admin",...) across ~15 routes) with dynamic RBAC:
roles are DATA, route guards check a PERMISSION.

@parking/shared defines a code-defined grid: RESOURCES (user/role/tariff/
subscription/site/device/shift/payment/session/event/report) × Action
(create/read/update/delete + domain verbs void/cash) -> PERMISSIONS
(resource:action, e.g. tariff:update, payment:create, event:void).

DB: new roles + role_permissions tables; users.role enum -> role_id FK;
migration 0007_rbac (create tables, seed the builtin admin role + all 26
perms, seed operator/cashier/readonly composable roles matching old
behaviour, rebuild users to swap the column copying all rows).

auth.ts: JWT payload role -> roleId; permissionsFor(roleId) with an
in-memory cache + bumpPermsCache(); requirePermission(...perms) preHandler;
requireAuth for /me & /language; initAuth(db) wires the resolver once. Every
route guard mapped to a permission; device ingress (devices/qr-reader) stays
auth-free by design. New routes/users.ts (user:* CRUD, bcrypt 12, last-admin
guard) + routes/roles.ts (role:* CRUD, builtin-protected, perms validated
against the grid, cache bump on write). auth/me + /login return
{roleId, roleName, permissions, language}. seed-admin -> roleId:'admin'.

Frontend: SessionUser carries permissions + can() helper; router nav/route
guards gate by permission (requirePerm replaces adminOnly); SiteSettings
edit gated by site:update; new UsersManager + RolesManager (permission
checkbox grid; admin role locked); i18n nav.users/roles + blocks (sq+en).

Decisions: one role per user; protected built-in admin (no-lockout: the last
admin can't be deleted/downgraded); JWT carries roleId, perms resolved
per-request so role edits apply immediately (no re-login).

Verified: full build green; 20-assertion inject test passes (cashier 403s on
tariff publish + user list, admin passes, granting a perm applies on the next
request, last-admin + builtin-role protections return 409); migration 0007
applied to a copy of the live DB (incl WAL/shm) — existing admin maps to
role_id='admin', all rows preserved. Append-only event chain untouched
(event:void gates appending a void, not a delete).

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

apps/server/src/routes/shift.ts

@@ -1,5 +1,5 @@
 import type { FastifyInstance } from "fastify";
-import { requireRole } from "../auth.js";
+import { requirePermission } from "../auth.js";
 import {
   InvalidCashMovementError,
   NoOpenShiftError,
@@ -19,8 +19,9 @@ interface CashMovementBody {
 // local-jwt-auth.md "until logout"). End Shift signs a shift_z_report + prints it.
 
 export async function shiftRoutes(app: FastifyInstance, shift: ShiftService): Promise<void> {
-  // Cashier/operator/admin run shifts; readonly can't.
-  const guard = requireRole("admin", "operator", "cashier");
+  // Reading the shift state vs. opening/closing one's own shift.
+  const readGuard = requirePermission("shift:read");
+  const guard = requirePermission("shift:create");
 
   // The SITE-WIDE shift state (at most one shift open at a time). The UI uses this
   // to render the header control: no shift → "Open"; my shift → "Close" (enabled);
@@ -28,7 +29,7 @@ export async function shiftRoutes(app: FastifyInstance, shift: ShiftService): Pr
   //  - open:    the open shift { startedAt, operator } or null (site-wide)
   //  - isMine:  true iff the open shift belongs to the requesting operator
   //  - operator: the requesting user (for the UI's own identity)
-  app.get("/api/shift/current", { preHandler: guard }, async (req) => {
+  app.get("/api/shift/current", { preHandler: readGuard }, async (req) => {
     const me = req.user.username;
     const open = shift.currentOpenShift();
     const heldBy = open?.identity ?? null;
@@ -47,7 +48,7 @@ export async function shiftRoutes(app: FastifyInstance, shift: ShiftService): Pr
   // amountMinor is signed: + load IN, − remove OUT. See wiki/concepts/shift.md.
   app.post<{ Body: CashMovementBody }>(
     "/api/cash-movement",
-    { preHandler: requireRole("admin") },
+    { preHandler: requirePermission("shift:cash") },
     async (req, reply) => {
       const { amountMinor, reason, currency } = req.body ?? ({} as CashMovementBody);
       try {