Implement share-link service (task 30)

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

src/modules/_core/schema.ts

@@ -106,6 +106,30 @@ export const activityLog = pgTable(
   (t) => [index("activity_log_household_created_idx").on(t.householdId, t.createdAt)],
 );
 
+export const shareLinks = pgTable(
+  "share_links",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    householdId: uuid("household_id")
+      .notNull()
+      .references(() => households.id, { onDelete: "cascade" }),
+    entityType: text("entity_type").notNull(),
+    entityId: uuid("entity_id").notNull(),
+    token: text("token").notNull().unique(),
+    capabilities: jsonb("capabilities").$type<{ read: boolean; write: boolean }>().notNull(),
+    createdBy: uuid("created_by")
+      .notNull()
+      .references(() => users.id, { onDelete: "cascade" }),
+    expiresAt: timestamp("expires_at", { withTimezone: true }),
+    revokedAt: timestamp("revoked_at", { withTimezone: true }),
+    createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
+  },
+  (t) => [
+    index("share_links_household_idx").on(t.householdId),
+    index("share_links_entity_idx").on(t.entityType, t.entityId),
+  ],
+);
+
 export const reminders = pgTable(
   "reminders",
   {