Add user settings, audit log, berth CRUD, and missing endpoints

- PATCH /api/v1/me: self-service profile update (name, phone, timezone)
- User settings page with profile editor + notification preferences
- Audit log API with filtering (entity, action, user, date range)
- Audit log page with search, entity type, and action filters
- Berth create/delete: POST /api/v1/berths + DELETE /api/v1/berths/[id]
- Client duplicates endpoint: GET /api/v1/clients/duplicates?name=
- Replace settings and audit stub pages with real implementations

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/validators/berths.ts

@@ -2,6 +2,31 @@ import { z } from 'zod';
 import { BERTH_STATUSES } from '@/lib/constants';
 import { baseListQuerySchema } from '@/lib/api/route-helpers';
 
+// ─── Create Berth ────────────────────────────────────────────────────────────
+
+export const createBerthSchema = z.object({
+  mooringNumber: z.string().min(1),
+  area: z.string().min(1),
+  lengthFt: z.coerce.number().optional(),
+  lengthM: z.coerce.number().optional(),
+  widthFt: z.coerce.number().optional(),
+  widthM: z.coerce.number().optional(),
+  draftFt: z.coerce.number().optional(),
+  draftM: z.coerce.number().optional(),
+  price: z.coerce.number().optional(),
+  priceCurrency: z.string().optional(),
+  status: z.enum(BERTH_STATUSES).default('available'),
+  tenureType: z.enum(['permanent', 'fixed_term']).optional(),
+  mooringType: z.string().optional(),
+  powerCapacity: z.string().optional(),
+  voltage: z.string().optional(),
+  access: z.string().optional(),
+  bowFacing: z.string().optional(),
+  sidePontoon: z.string().optional(),
+});
+
+export type CreateBerthInput = z.infer<typeof createBerthSchema>;
+
 // ─── Update Berth ─────────────────────────────────────────────────────────────
 
 export const updateBerthSchema = z.object({