Add top-level members list, primary member on account, member move, combined create flows

- GET /v1/members with search across all members (includes account name)
- POST /members/:id/move with optional accountId (creates new account if omitted)
- primary_member_id on account table, auto-set when first member added
- isMinor flag on member create (manual override when no DOB provided)
- Account search now includes member names
- New account form includes primary contact fields, auto-generates name
- Members page in sidebar with global search

packages/shared/src/schemas/account.schema.ts

@@ -34,6 +34,7 @@ export const MemberCreateSchema = z.object({
   firstName: z.string().min(1).max(100),
   lastName: z.string().min(1).max(100),
   dateOfBirth: z.string().date().optional(),
+  isMinor: z.boolean().optional(),
   email: z.string().email().optional(),
   phone: z.string().max(50).optional(),
   notes: z.string().optional(),