Phase 5.x payment revamp + Xendit Stage-8 prep

- Backend wraps idn-finlogos npm at /assets/payment-icons/<slug>.svg with
  1y immutable cache. Mobile drops bundled SVGs (only placeholder remains)
  and fetches via flutter_cache_manager. payment_methods.icon is now a
  CSV of slugs; catalog emits icon_urls[]. CARDS tile renders Visa + MC +
  JCB side by side.
- Per-method min/max amount bounds (BIGINT, nullable). Picker greys out
  out-of-range tiles with subtitle; backend gates with INVALID_PAYMENT_AMOUNT
  (422). Defense in depth against stale-catalog clients.
- Xendit channel codes corrected from authoritative docs
  (BCA_VA -> BCA_VIRTUAL_ACCOUNT, CREDIT_CARD -> CARDS, ovo -> ovo-new,
  shopeepay -> shopee-pay, ...). 18 methods x 5 groups seeded with
  Xendit-published per-channel min/max.
- Re-runnable seed (ON CONFLICT DO NOTHING on payment_code + new unique
  index on group name). Operator CC edits never clobbered across re-runs.
  One-shot reset + inspect scripts under backend/.dev/.
- Customer redirect HTML pages at /payment/return/{success,failure},
  brand-styled with "Buka HaloBestie" CTA firing halobestie:// deeplink.
  URL scheme registered on Android (intent-filter w/ BROWSABLE on
  MainActivity) and iOS (CFBundleURLTypes). Waiting-payment poller still
  owns confirmation; deeplink just brings the activity to foreground.
- Control center payment-catalog page: min/max inputs + columns. Other
  CC pages restyled with new theme tokens (separate work, bundled here).

169/169 backend tests pass. See requirement/phase5-payment-revamp-2026-05-27.md
for the full revamp doc. Stage 8 (E2E) still pending: webhook URL routing
decision + two client_app follow-ups (legacy /chat/request removal,
extension Custom Tab).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

control_center/src/components/ui/HBLogo.jsx

@@ -0,0 +1,36 @@
+// Brand mark — mirrors client_app/lib/features/splash/splash_screen.dart:
+// pink #FF699F rounded-square tile, logo image scaled to 1.4× (the source PNG
+// has ~25% internal whitespace), soft shadow.
+import logoUrl from '../../assets/logo.png'
+
+export default function HBLogo({ size = 56, radius, shadow = true, style = {} }) {
+  const r = radius ?? Math.round(size * 0.25) // matches Flutter radius:24 on 96px
+  return (
+    <div
+      style={{
+        width: size,
+        height: size,
+        borderRadius: r,
+        background: '#FF699F',
+        overflow: 'hidden',
+        flexShrink: 0,
+        display: 'flex',
+        alignItems: 'center',
+        justifyContent: 'center',
+        boxShadow: shadow ? 'var(--hb-shadow-soft)' : 'none',
+        ...style,
+      }}
+    >
+      <img
+        src={logoUrl}
+        alt="Halo Bestie"
+        draggable={false}
+        style={{
+          width: '140%',
+          height: '140%',
+          objectFit: 'cover',
+        }}
+      />
+    </div>
+  )
+}