fix(profile): accept 'wownero' for default_qr_logo (was xmrcheckout literal)

ProfileResponse schema's default_qr_logo literal was inherited from
xmrcheckout: Literal["monero", "none", "custom"]. The DB column
(models.py) defaults to "wownero" and main.py's migration backfills
NULL → ... but the backfill also wrote "monero", contradicting the
column default.

End result: new users got default_qr_logo="wownero" (from the
column default), but GET /api/core/profile blew up with a Pydantic
ResponseValidationError on serialization because "wownero" isn't in
the literal. UI showed "Unavailable" for both Store ID and Primary
Address because the entire profile response 500'd, leaving
profileData null on the dashboard. API key + webhook secret rendered
fine because those come from cookies, not profileData.

Fix:
- schemas.py: QrLogoMode now Literal["wownero", "monero", "none",
  "custom"] (keep "monero" for backward compat with any rows from
  before the migration ran)
- schemas.py: ProfileResponse.default_qr_logo default → "wownero"
- main.py: backfill UPDATE → 'wownero' (was 'monero'); migration
  column DEFAULT already correct as 'wownero'
- ui/dashboard/page.tsx: TS type for default_qr_logo widened to
  include "wownero"; fallback default → "wownero"
- ui/dashboard/actions.ts: DefaultQrLogoState.logo type widened;
  validation in updateDefaultQrLogo + initialMetadataPayload now
  accepts "wownero"

Suchshop didn't hit this because their wowcheckout user row was
created back when this UI path wasn't being used (they were
provisioned via direct SQL/API). The new shop.wowne.ro merchant
created via the UI today triggered the column default → exposed
the schema mismatch.

api/app/schemas.py

@@ -18,7 +18,11 @@ from .formatting import format_xmr_amount
 
 InvoiceStatus = Literal["pending", "payment_detected", "confirmed", "expired", "invalid"]
 BtcpayCheckoutStyle = Literal["standard", "btcpay_classic"]
-QrLogoMode = Literal["monero", "none", "custom"]
+# "wownero" is the wowcheckout default; "monero" kept as an accepted
+# value for backward compat with any rows written before the
+# fork-rename. New rows are created with "wownero" (see models.py
+# server_default + main.py migration backfill).
+QrLogoMode = Literal["wownero", "monero", "none", "custom"]
 
 
 class InvoiceCreate(BaseModel):
@@ -200,7 +204,7 @@ class ProfileResponse(BaseModel):
     id: UUID
     payment_address: str
     default_confirmation_target: conint(ge=0, le=10) = 1
-    default_qr_logo: QrLogoMode = "monero"
+    default_qr_logo: QrLogoMode = "wownero"
     default_qr_logo_data_url: str | None = None
     btcpay_checkout_style: BtcpayCheckoutStyle = "btcpay_classic"
     created_at: datetime