feat: add client_addresses table for multi-address storage

Adds client_addresses table with cascade deletes, port scoping, primary address flag, and indexes. Updates clientsRelations and portsRelations, adds clientAddressesRelations. Generates migration 0000_narrow_longshot.sql.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/db/schema/relations.ts

@@ -14,6 +14,7 @@ import {
   clientNotes,
   clientTags,
   clientMergeLog,
+  clientAddresses,
 } from './clients';
 
 // Interests
@@ -100,6 +101,7 @@ export const portsRelations = relations(ports, ({ many }) => ({
   berthMaintenanceLogs: many(berthMaintenanceLog),
   clientMergeLogs: many(clientMergeLog),
   clientRelationships: many(clientRelationships),
+  clientAddresses: many(clientAddresses),
 }));
 
 // ─── Users ────────────────────────────────────────────────────────────────────
@@ -156,6 +158,7 @@ export const clientsRelations = relations(clients, ({ one, many }) => ({
   waitingListEntries: many(berthWaitingList),
   scratchpadNotes: many(scratchpadNotes),
   formSubmissions: many(formSubmissions),
+  addresses: many(clientAddresses),
 }));
 
 export const clientContactsRelations = relations(clientContacts, ({ one }) => ({
@@ -165,6 +168,17 @@ export const clientContactsRelations = relations(clientContacts, ({ one }) => ({
   }),
 }));
 
+export const clientAddressesRelations = relations(clientAddresses, ({ one }) => ({
+  client: one(clients, {
+    fields: [clientAddresses.clientId],
+    references: [clients.id],
+  }),
+  port: one(ports, {
+    fields: [clientAddresses.portId],
+    references: [ports.id],
+  }),
+}));
+
 export const clientRelationshipsRelations = relations(clientRelationships, ({ one }) => ({
   port: one(ports, {
     fields: [clientRelationships.portId],