feat: pre-registrant management and invitation system

Admin interface to review, filter, and batch-invite the 95 pre-registrants
from Baby Ghosts. Accept-invitation page pre-fills their data and collects
circle, pronouns, motivation, contribution tier, and agreement before
creating their member record.

server/utils/schemas.js

@@ -351,6 +351,39 @@ export const memberInviteSchema = z.object({
   emailTemplate: z.string().min(1).max(10000)
 })
 
+// --- Pre-registrant schemas ---
+
+export const preRegistrantStatusUpdateSchema = z.object({
+  status: z.enum(['pending', 'selected']),
+  adminNotes: z.string().max(2000).optional()
+})
+
+export const preRegistrantBulkStatusSchema = z.object({
+  ids: z.array(z.string().min(1)).min(1).max(100),
+  status: z.enum(['pending', 'selected'])
+})
+
+export const preRegistrantInviteSchema = z.object({
+  preRegistrantIds: z.array(z.string().min(1)).min(1).max(20),
+  emailTemplate: z.string().min(1).max(10000)
+})
+
+export const inviteVerifySchema = z.object({
+  token: z.string().min(1)
+})
+
+export const inviteAcceptSchema = z.object({
+  preRegistrationId: z.string().min(1),
+  name: z.string().min(1).max(200),
+  pronouns: z.string().max(100).optional(),
+  location: z.string().max(200).optional(),
+  circle: z.enum(['community', 'founder', 'practitioner']),
+  motivation: z.string().max(5000).optional(),
+  contributionTier: z.enum(['0', '5', '15', '30', '50']),
+  agreedToTerms: z.literal(true),
+  token: z.string().min(1)
+})
+
 // --- Tag schemas ---
 
 export const tagSuggestionSchema = z.object({