Billing rework

src/lib/validation.ts

@@ -86,6 +86,13 @@ export const billingAddressSchema = z
     country: z.enum(SUPPORTED_COUNTRIES, {
       message: "Please choose a country from the list",
     }),
+    // Bug 35: VAT identifier. Required for company customers (B2B);
+    // omitted entirely for personal customers (B2C — private
+    // individuals don't have a VAT number). The schema marks it
+    // optional because the same schema is used for both flows;
+    // company-vs-personal enforcement happens at the API layer where
+    // `user.isPersonal` is known.
+    vatNumber: z.string().trim().max(50).optional(),
   })
   .superRefine((data, ctx) => {
     const pattern = POSTAL_CODE_PATTERNS[data.country];
@@ -123,6 +130,12 @@ export const billingStepSchema = z.object({
  * Full onboarding payload. Used by the API route and by the wizard's
  * submit handler. `packageSecrets` is a free-shape map that gets
  * encrypted by the server before it touches the DB.
+ *
+ * Bug 35: `billingAddress` is now optional at the schema level. The
+ * wizard omits it entirely when the org already has an `org_billing`
+ * record. The API enforces "billing must exist by the end" by either
+ * looking up the existing org_billing row OR validating the supplied
+ * payload — neither path can be skipped without a 400.
  */
 export const onboardingSchema = z.object({
   instanceName: z
@@ -139,7 +152,7 @@ export const onboardingSchema = z.object({
   packageSecrets: z
     .record(z.string(), z.record(z.string(), z.string()))
     .optional(),
-  billingAddress: billingAddressSchema,
+  billingAddress: billingAddressSchema.optional(),
   billingNotes: z.string().max(2_000).optional(),
 });