feat(berths): add per-berth pricing + last_imported_at columns

Adds the 5 pricing columns surfaced by the per-berth PDFs (Phase 6b
will populate them via the OCR parser) and the last_imported_at marker
the NocoDB import script (Phase 0c) uses to detect human edits and
skip overwriting them.

- weekly_rate_high_usd / weekly_rate_low_usd
- daily_rate_high_usd  / daily_rate_low_usd
- pricing_valid_until (date) - drives the "stale pricing" chip on
  the berth detail page when older than today
- last_imported_at - compared against updated_at so re-running the
  import preserves CRM-side overrides

tenure_type comment widens to include 'fee_simple' and 'strata_lot'
to match the per-berth PDF tenure model; the column is plain text
so no DB-level enum change is required.

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

src/lib/db/migrations/0025_berth_pricing_columns.sql

@@ -0,0 +1,6 @@
+ALTER TABLE "berths" ADD COLUMN "weekly_rate_high_usd" numeric;--> statement-breakpoint
+ALTER TABLE "berths" ADD COLUMN "weekly_rate_low_usd" numeric;--> statement-breakpoint
+ALTER TABLE "berths" ADD COLUMN "daily_rate_high_usd" numeric;--> statement-breakpoint
+ALTER TABLE "berths" ADD COLUMN "daily_rate_low_usd" numeric;--> statement-breakpoint
+ALTER TABLE "berths" ADD COLUMN "pricing_valid_until" date;--> statement-breakpoint
+ALTER TABLE "berths" ADD COLUMN "last_imported_at" timestamp with time zone;

src/lib/db/migrations/meta/_journal.json

@@ -176,6 +176,13 @@
       "when": 1777938954111,
       "tag": "0024_normalize_mooring_numbers",
       "breakpoints": true
+    },
+    {
+      "idx": 25,
+      "version": "7",
+      "when": 1777939212954,
+      "tag": "0025_berth_pricing_columns",
+      "breakpoints": true
     }
   ]
 }