feat(berths): bulk price update + per-berth price API

Two new endpoints lift price editing out of the full berth-update form:

- `PATCH /api/v1/berths/[id]/price` — single-berth price edit triggered
  inline from the berth list / detail (no need to open the heavy edit
  modal just to retag a price).
- `POST /api/v1/berths/bulk-update-prices` — multi-row update from a
  selection in the berth list; transactional, audit-logged per row.

Berth list column gets an inline price-edit affordance backed by the
single-berth endpoint; the bulk action lives in the row-selection
toolbar.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/validators/berths.ts

@@ -120,6 +120,39 @@ export const listBerthsSchema = baseListQuerySchema.extend({
 
 export type ListBerthsQuery = z.infer<typeof listBerthsSchema>;
 
+// ─── Update Berth Price ───────────────────────────────────────────────────────
+// Single + bulk price update. Carved out from the general updateBerthSchema
+// so that callers with the `berths.update_prices` permission (but NOT the
+// generic `berths.edit`) can only mutate price + currency, not dimensions
+// or mooring metadata.
+
+export const updateBerthPriceSchema = z.object({
+  price: z.coerce.number().min(0, 'Price must be ≥ 0').nullable(),
+  priceCurrency: z
+    .string()
+    .trim()
+    .length(3, 'Currency must be a 3-letter ISO code')
+    .toUpperCase()
+    .optional(),
+});
+
+export type UpdateBerthPriceInput = z.infer<typeof updateBerthPriceSchema>;
+
+export const bulkUpdateBerthPricesSchema = z.object({
+  updates: z
+    .array(
+      z.object({
+        berthId: z.string().uuid(),
+        price: z.coerce.number().min(0).nullable(),
+        priceCurrency: z.string().trim().length(3).toUpperCase().optional(),
+      }),
+    )
+    .min(1, 'At least one berth required')
+    .max(500, 'Bulk price updates capped at 500 berths per call'),
+});
+
+export type BulkUpdateBerthPricesInput = z.infer<typeof bulkUpdateBerthPricesSchema>;
+
 // ─── Add Maintenance Log ──────────────────────────────────────────────────────
 
 export const addMaintenanceLogSchema = z.object({