ticket: site metadata header + scannable Albanian ticket; widen barcode

- site_config gains optional park identity (park_name, operator_name, nius,
  address, phone, email); additive Drizzle migration 0001. GET/PUT
  /api/site-config read/write the full config (PUT partial patch, admin only);
  SiteSettings + SetupWizard expose the fields.
- renderTicket() prints an Albanian header sourced from site_config, the
  all-numeric 13-digit ticket id (12 random + Luhn) as Code128, large digits,
  and a lost-ticket footer. CP852 codepage so ë/ç render.
- Widen the Code128 module width 2->3 and height 80->100 dots so the
  short-range "Simple" QR/barcode reader decodes reliably (was barely reading
  at module width 2 on the 80mm head).

See wiki/concepts/site-metadata.md and ticket-encoding.md.

wiki/index.md

@@ -7,7 +7,7 @@ updated: 2026-06-14
 # Index
 
 Content catalog for the wiki. Start at [[overview]]. Maintained on every ingest.
-Counts: 3 sources · 19 entities · 24 concepts · 5 decision records.
+Counts: 3 sources · 19 entities · 25 concepts · 5 decision records.
 
 ## Overview & navigation
 - [[overview]] — the top-level synthesis and entry point.
@@ -80,6 +80,7 @@ Counts: 3 sources · 19 entities · 24 concepts · 5 decision records.
 - [[tariff]] — fee model; pure, data-driven, offline; pay-on-foot adds a walk-back grace window.
 - [[shift]] — manned-only accountability period; explicit Start/End (not time-based); End → signed + printed Z-report (cash + POS).
 - [[capacity-occupancy]] — live count = open sessions; refuse entry + FULL sign when full (soft policy); exit never blocked.
+- [[site-metadata]] — optional park identity (name, operator, VAT, address, contact) in site_config; feeds the ticket header.
 - [[valet-overcapacity]] — "full" is soft: operator may valet-accept over capacity (keys handed over, custody). Manned, deferred.
 - [[validation-discounts]] — merchant validates a ticket → signed discount event applied at fee time.
 - [[reporting-analytics]] — revenue/occupancy/stay reports + plate-search, all projections over the signed log.