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/contacts.ts

@@ -0,0 +1,20 @@
+import { z } from 'zod'
+import { emailField } from './primitives'
+
+export const createContactSchema = z.object({
+  name: z.string().min(1, 'Name is required').max(200),
+  contact_type: z.enum(['vendor', 'supplier', 'partner', 'landlord', 'city']),
+  email: emailField().optional().nullable(),
+  phone: z.string().max(20).optional().nullable(),
+  details: z.string().max(500).optional().nullable(),
+  note: z.string().max(2000).optional().nullable(),
+  group_label: z.string().max(100).optional().nullable(),
+  tags: z.array(z.string().max(50)).max(10).optional(),
+  code: z.string().max(50).optional().nullable(),
+})
+
+export const updateContactSchema = createContactSchema.partial().extend({
+  contactId: z.string().uuid('Invalid contact ID'),
+})
+
+export type CreateContactInput = z.infer<typeof createContactSchema>