feat(schema): berths.archived_at + clients.source_inquiry_id + email_bounces

Step 3 schema additions per PRE-DEPLOY-PLAN § 1.4.

berths.archived_at (+ archived_by, archive_reason) — soft-delete column
so retired moorings can be hidden from the public feed and admin lists
without losing historical interest joins. Partial index `idx_berths_active`
on (port_id) WHERE archived_at IS NULL keeps the active-only list path
fast. Already wired:
- /api/public/berths and /api/public/berths/[mooringNumber] now filter
  out archived rows.
- berths.service.listBerths defaults to active-only with an
  ?includeArchived=true escape hatch for the archive bin.

clients.source_inquiry_id — text column with ON DELETE SET NULL FK to
website_submissions(id). Preserves the linkage from a website inquiry
to the client that came out of the "Convert to client" triage flow
(P-4.5). Drives the conversion-funnel-by-source chart (Step 6). The
Drizzle column ships without `.references()` to avoid the cross-file
circular import; the FK lives in the migration SQL.

email_bounces table — bounce-monitoring storage. The DSN poller worker
(forthcoming, depends on this table existing) writes one row per parsed
bounce; consumers join via (original_send_type, original_send_id).
Three secondary indexes cover the expected access patterns (port +
recent bounces; lookup by bounced address; lookup by original send).

Schema additions plus the migration SQL are ready for `pnpm db:push`
(or the migration runner once its journal is backfilled — separate
concern, journal currently stops at 0042 despite migrations through
0065 existing on disk).

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

src/lib/db/schema/clients.ts

@@ -30,6 +30,12 @@ export const clients = pgTable(
     timezone: text('timezone'),
     source: text('source'), // website, manual, referral, broker
     sourceDetails: text('source_details'),
+    /** When this client came out of a "Convert inquiry to client" triage
+     *  step, points back at the originating `website_submissions` row.
+     *  Drives the conversion-funnel-by-source chart. Migration 0065
+     *  installs the FK with ON DELETE SET NULL — Drizzle doesn't reflect
+     *  it here to avoid the cross-file circular import. */
+    sourceInquiryId: text('source_inquiry_id'),
     archivedAt: timestamp('archived_at', { withTimezone: true }),
     /** Better-auth user id of the operator who archived this client. */
     archivedBy: text('archived_by'),