feat(server): add defaultAutoRotateIntervalDays to instance settings schema and API

packages/server/src/db/migrate.ts

@@ -215,6 +215,12 @@ export function runMigrations(db: Database.Database): void {
         { name: 'federation_relay_ttl_days', type: 'INTEGER NOT NULL DEFAULT 30' },
       ]
     },
+    {
+      name: 'instance_settings',
+      columns: [
+        { name: 'default_auto_rotate_interval_days', type: 'INTEGER NOT NULL DEFAULT 90' },
+      ]
+    },
     {
       name: 'federation_peers',
       columns: [

packages/server/src/db/schema.ts

@@ -274,6 +274,7 @@ export const instanceSettings = sqliteTable('instance_settings', {
   maxUploadSizeBytes: integer('max_upload_size_bytes'),
   federationRelayEnabled: integer('federation_relay_enabled').notNull().default(1),
   federationRelayTtlDays: integer('federation_relay_ttl_days').notNull().default(30),
+  defaultAutoRotateIntervalDays: integer('default_auto_rotate_interval_days').notNull().default(90),
   updatedAt: integer('updated_at').notNull(),
 });