fix(audit): non-Documenso backlog sweep — port-binding, NULLS NOT DISTINCT, custom merge tokens, company docs

Wave through the remaining audit-final-deferred items that aren't blocked
on the back-burnered Documenso work.

Multi-tenant isolation:
- Storage proxy ProxyTokenPayload gains optional `p` (port slug) claim;
  verifier asserts `key.startsWith(${p}/)`. Defense-in-depth against a
  buggy issuer in some future code path that mixes port scopes — every
  storage key generated by generateStorageKey() already prefixes the
  slug. document-sends opts in for 24h emailed download links; other
  callers continue working unchanged via the optional field.

DB schema reconciliation:
- Migration 0047 rebuilds system_settings unique index with NULLS NOT
  DISTINCT (Postgres 15+) so global settings (port_id IS NULL) are
  uniquely keyed by `key` alone. Surfaced + dedupe'd 65 duplicate
  (storage_backend, NULL) rows that had accumulated from race-prone
  delete-then-insert patterns in ocr-config / settings / residential-
  stages / ai-budget services. All four services converted to true
  onConflictDoUpdate upserts so the race window is closed.

API uniformity:
- Response shape standardization: 16 routes converted from
  `{ success: true }` to 204 No Content. CLAUDE.md documents the
  convention (`{ data: <T> }` for content, 204 for empty mutations,
  portal-auth retains `{ success: true }` for the frontend's auth chain).
- req.json() → parseBody() migration across 9 admin/CRM routes
  (custom-fields, expenses/export ×3, currency convert,
  search/recently-viewed, admin/duplicates, berths/pdf-{upload-url,
  versions, parse-results}). Uniform 400 error shapes for
  ZodError-flagged bodies.

Custom-fields merge tokens (shipped end-to-end):
- merge-fields.ts gains CUSTOM_MERGE_TOKEN_RE + helpers for the
  `{{custom.<fieldName>}}` shape.
- document-templates validator accepts the dynamic shape alongside
  the static catalog tokens.
- document-sends.service mergeCustomFieldValues resolver fetches
  per-port custom_field_definitions for client/interest/berth contexts
  and substitutes stored values keyed by `{{custom.fieldName}}`.
- custom-fields-manager amber banner updated to reflect that merge
  tokens now expand (search index + entity-diff remain documented
  design limitations).

/api/v1/files cross-entity filtering:
- Validator + listFiles + uploadFile accept companyId AND yachtId
  alongside clientId. file-upload-zone propagates both.
- New CompanyFilesTab component mirrors ClientFilesTab; restored as a
  visible Documents tab in company-tabs.tsx (was a hidden stub).

Inline TODOs:
- Reviewed remaining two TODOs (per-user reminder schedule, import
  worker handlers). Both are placeholders for future feature surfaces,
  not bugs — per-port digest works for every customer; nothing
  currently enqueues import jobs (verified). Annotated in BACKLOG.

BACKLOG.md updated to reflect what landed and what's still pending
(Documenso-related items still bundled with the back-burnered phases).

Tests: 1185/1185 vitest, tsc clean.

src/lib/services/ocr-config.service.ts

@@ -66,20 +66,27 @@ async function readRow(portId: string | null): Promise<StoredOcrConfig | null> {
 }
 
 async function writeRow(portId: string | null, value: StoredOcrConfig, userId: string) {
-  // upsert: delete + insert keeps logic simple given the (key, port_id) unique index.
+  // True upsert. The previous delete-then-insert pattern had a race
+  // window where two concurrent writes could both DELETE and both INSERT,
+  // accumulating duplicate rows (caught and dedupe'd by migration 0047).
+  // The (key, port_id) NULLS NOT DISTINCT unique index makes this
+  // upsert atomic.
   await db
-    .delete(systemSettings)
-    .where(
-      portId === null
-        ? and(eq(systemSettings.key, KEY), isNull(systemSettings.portId))
-        : and(eq(systemSettings.key, KEY), eq(systemSettings.portId, portId)),
-    );
-  await db.insert(systemSettings).values({
-    key: KEY,
-    portId,
-    value: value as unknown as Record<string, unknown>,
-    updatedBy: userId,
-  });
+    .insert(systemSettings)
+    .values({
+      key: KEY,
+      portId,
+      value: value as unknown as Record<string, unknown>,
+      updatedBy: userId,
+    })
+    .onConflictDoUpdate({
+      target: [systemSettings.key, systemSettings.portId],
+      set: {
+        value: value as unknown as Record<string, unknown>,
+        updatedBy: userId,
+        updatedAt: new Date(),
+      },
+    });
 }
 
 /**