feat(uat-batch): Groups R + T — Documenso list + deferred bugs

R62, T64, T65 from the 2026-05-21 plan. U66 deferred with reasoning.

Shipped:
  R62  Documenso-first templates (list endpoint + admin route).
       New `listTemplates(portId)` in documenso-client paginates
       through every visible template on the configured instance
       (5-page cap at 100/page = 500 templates which comfortably
       covers every observed Documenso deploy). Handles v1 + v2
       endpoint shapes; normalises to `{ id, name }` summaries.
       New `GET /api/v1/admin/documenso/templates` route exposes
       the list to the admin UI (gated on `admin.manage_settings`).
       Powers the upcoming admin template picker — the field-mapping
       editor + sync-now button + per-template badges stay as the
       picker-UI follow-up. Data path is in place; UI surface
       lands in a dedicated PR alongside the field-mapping editor.

  T64  Duplicate E17 + missing partial unique index. Migration 0082
       deduplicates any existing (port_id, mooring_number) collisions
       by archiving all but the canonical row (prefers price-bearing
       rows, then earliest-created; archived rows carry an explicit
       `archive_reason` noting the migration). Adds partial unique
       index `uniq_berths_port_mooring_active` on (port_id,
       mooring_number) WHERE archived_at IS NULL so archived
       moorings can be reissued but live duplicates can't be
       created in the first place. Migration applied to dev DB.

  T65  Stage-advance gate. `changeInterestStage` now blocks any
       non-override transition into eoi / reservation / deposit_paid
       / contract when the primary berth has no price (NULL or 0)
       — these stages all render the price in templates / merge
       fields and a $0 generation is a real production gotcha.
       Override path (sales-manager fix) stays open and records
       the reason in audit log per the existing override-reason
       gate.

Deferred:
  U66  EOI bundle UX rework (10-14h) — multi-berth picker inside
       the EOI generate dialog. Schema (`interest_berths.isInEoiBundle`)
       and the rendered bundle-range preview row both exist; the
       remaining work is the picker UI + re-deriving merge tokens
       per selection state. Best done as a focused session with
       Documenso-side verification.

Verified: tsc clean, vitest 1454/1454, migration applied.

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

src/lib/db/migrations/0082_berth_mooring_unique.sql

@@ -0,0 +1,48 @@
+-- 2026-05-21: enforce unique mooring numbers per port at the DB level.
+--
+-- The canonical mooring regex is `^[A-Z]+\d+$` (e.g. `A1`, `B12`) and
+-- the UI gates on uniqueness, but no DB-level constraint existed —
+-- which led to a duplicate E17 row in port-nimara surfaced during UAT.
+-- Partial unique index lets archived rows reuse a mooring (an old A1
+-- can be re-issued after the original is archived).
+--
+-- Before applying: any existing duplicates must be resolved. The
+-- backfill below merges duplicate E17-style rows into a single canonical
+-- row, preferring the one with a price (real berth) over the empty
+-- shadow. If multiple price-bearing rows exist, the earliest-created
+-- wins and the others archive.
+
+-- Phase 1: dedupe. Pick a canonical id per (port_id, mooring_number)
+-- where archived_at IS NULL.
+WITH ranked AS (
+  SELECT
+    id,
+    port_id,
+    mooring_number,
+    price,
+    created_at,
+    ROW_NUMBER() OVER (
+      PARTITION BY port_id, mooring_number
+      ORDER BY
+        -- Prefer rows that have a price (real berths)
+        CASE WHEN price IS NOT NULL THEN 0 ELSE 1 END,
+        -- Then earliest-created so the audit trail stays consistent
+        created_at ASC,
+        id ASC
+    ) AS rn
+  FROM berths
+  WHERE archived_at IS NULL
+)
+UPDATE berths
+SET
+  archived_at = now(),
+  archive_reason = 'Auto-archived 2026-05-21: duplicate of canonical row (mooring uniqueness migration)'
+WHERE id IN (
+  SELECT id FROM ranked WHERE rn > 1
+);
+
+-- Phase 2: the partial unique index. Excludes archived rows so old
+-- moorings can be reissued; includes everything else.
+CREATE UNIQUE INDEX IF NOT EXISTS uniq_berths_port_mooring_active
+  ON berths (port_id, mooring_number)
+  WHERE archived_at IS NULL;