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/index.ts

@@ -0,0 +1,26 @@
+export * from './primitives'
+export * from './auth'
+export * from './tasks'
+export * from './projects'
+export * from './members'
+export * from './contacts'
+export * from './knowledge-base'
+export * from './secrets'
+export * from './payments'
+export * from './settings'
+export * from './area-leads'
+export * from './governance'
+export * from './onboarding'
+export * from './areas'
+export * from './forum'
+export * from './permissions'
+export * from './import'
+export * from './forms'
+export * from './certifications'
+export * from './classes'
+export * from './equipment'
+export * from './door'
+export * from './presence'
+export * from './ids'
+export * from './notification-prefs'
+export * from './dues'