refactor(validations): split lib/validations.ts into a barrel'd folder (slice 1)

1141-line lib/validations.ts → lib/validations/<feature>.ts + primitives.ts +
an index.ts barrel. '@/lib/validations' now resolves to the barrel, so all 40
importers are untouched. Every one of the 143 exports is preserved verbatim
(verified by symbol-diff); schemas moved unchanged. tsc 0, 635 tests green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/validations/ids.ts

@@ -0,0 +1,19 @@
+import { z } from 'zod'
+
+export const uuidSchema = z.string().uuid('Invalid ID format')
+
+export const bulkMemberIdsSchema = z
+  .array(z.string().uuid('Invalid member ID'))
+  .min(1, 'Select at least one member')
+  .max(1000)
+
+// Stripe dues config (admin). Secret fields are write-only: omitted/blank
+// means "keep the stored one". prices maps a membership tier -> Stripe Price.
+export const stripeSettingsSchema = z.object({
+  mode: z.enum(['test', 'live']),
+  publishable_key: z.string().trim().max(255).optional().nullable(),
+  secret_key: z.string().trim().max(255).optional().nullable(),
+  webhook_secret: z.string().trim().max(255).optional().nullable(),
+  grace_days: z.number().int().min(0).max(90).optional().default(7),
+  prices: z.record(z.string().trim().max(255)).optional().default({}),
+})