feat(tills): per-till activity log, wash bucket on the booth Z-report, wash-desk printer role

Closes the three known follow-ups of the Tills decision (venue-modules.md):

- Activity log per till: `tillOfEvent(type, payload)` in @parking/shared (money events
  by payload till, other events by their owning module's till, everything else booth),
  applied by `/api/events?till=` in SQL and passed by the hub log, the Drawer "today"
  panel and the booth feed (history + live pushes). The events route admits a role that
  holds a module feed permission without event:read and returns only that module's
  event types — the live-socket rule.
- Booth Z-report: `chargesByModuleMinor` sums the chargeLines on the till's payments by
  module; the ticket bucket excludes them (Bileta = parking only); printed
  "Lavazh (në biletë)" only when any was taken. The wash till's slip prints "Lavazh:".
- Printer role `wash-desk`: the wash till's Z-report and vouchers print there, falling
  back to the booth printer; nothing falls back to the desk. `printerRoleOf()` is the
  one reading of the role field (the entry/booth loaders treated any non-booth role as
  an entry dispenser). Footer label "at wash desk".

Also: `GET /api/carwash/settings` opens to carwash:read OR site:read (new
requireAnyPermission) — the Wash operator job could not load the desk's category and
service pickers. Tests for all four; wiki (shift, printer-roles-failover, venue-modules,
log) updated.

Claude-Session: https://claude.ai/code/session_01FWncR69HgGPuei1dLrW3cU

wiki/concepts/printer-roles-failover.md

@@ -17,8 +17,10 @@ Each printer instance (a `devices` row, category `printer`) declares a **role**
 config:
 
 - **`entry-dispenser`** — outside, at the lane. Prints the entry ticket the driver takes.
-- **`booth-receipt`** — inside the booth. Prints receipts at exit/payment, AND serves as the
-  **backup** for entry tickets.
+- **`booth-receipt`** — inside the booth. Prints receipts at exit/payment, the booth till's
+  Z-reports and vouchers, AND serves as the **backup** for entry tickets (and for wash slips).
+- **`wash-desk`** — at the Car Wash desk (added 2026-09-06). Prints the wash till's slips:
+  its Z-report and drawer vouchers (see [[shift]] §Tills). Nothing else ever prints here.
 
 It also declares a **`failoverRank`** (higher = preferred within a role) to order multiple
 printers of the same role deterministically (ties broken by id).
@@ -33,6 +35,16 @@ The reverse is **deliberately not** done: a **receipt** never prints on the outs
 Receipts are a booth-only job; an entry dispenser falling back to print receipts makes no
 physical sense.
 
+For a **wash slip** (`wantRole = wash-desk`): the desk printers first, then the **booth
+printer** — a site that has not bought a desk printer keeps printing the wash till's Z-report
+and vouchers in the booth, exactly as it did before the role existed. Nothing falls back *to*
+the wash desk: a booth receipt or an entry ticket never prints there. `ShiftService` resolves
+the role from the till (`TILL_PRINTER_ROLE`: booth → `booth-receipt`, carwash → `wash-desk`)
+and keeps one legacy fallback — a booth with a single printer that carries no booth role still
+prints its slips on it. `printerRoleOf(config)` is the one reading of the saved `role` field,
+so every loader (entry flow, booth receipts, shift slips) agrees on what a printer is; the
+device footer shows a desk printer as "at wash desk".
+
 ## Where the logic lives
 
 - The driver (`rongta`) is **role-agnostic** — role/rank are just config; the transport doesn't