fix: rebuild dynamic routes cache on server restart

follow up on #4525

src/node/config.ts

@@ -130,7 +130,7 @@ export async function resolveConfig(
     userConfig,
     sitemap: userConfig.sitemap,
     buildConcurrency: userConfig.buildConcurrency ?? 64,
-    ...(await resolvePages(srcDir, userConfig, logger))
+    ...(await resolvePages(srcDir, userConfig, logger, true))
   }
 
   // to be shared with content loaders

src/node/plugins/dynamicRoutesPlugin.ts

@@ -70,8 +70,14 @@ export function defineRoutes(loader: RouteModule) {
 export async function resolvePages(
   srcDir: string,
   userConfig: UserConfig,
-  logger: Logger
+  logger: Logger,
+  rebuildCache = false
 ): Promise<Pick<SiteConfig, 'pages' | 'dynamicRoutes' | 'rewrites'>> {
+  if (rebuildCache) {
+    moduleGraph = new ModuleGraph()
+    routeModuleCache.clear()
+  }
+
   // Important: tinyglobby doesn't guarantee order of the returned files.
   // We must sort the pages so the input list to rollup is stable across
   // builds - otherwise different input order could result in different exports