fix(build): clear markdown cache with rewritten path on include change

The markdownToVue compile cache is keyed by the rewrite-applied
relativePath, but include-triggered invalidation passed the source
path, so pages with rewrites served stale content in dev when an
included file changed.

closes #5035

Co-authored-by: yyznm <yyz_nm@163.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/node/plugin.ts

@@ -413,7 +413,8 @@ export async function createVitePressPlugin(
       }
 
       importerMap[slash(file)]?.forEach((relativePath) => {
-        clearCache(relativePath)
+        // the compile cache is keyed by the rewritten path
+        clearCache(siteConfig.rewrites.map[relativePath] || relativePath)
         const mod = this.environment.moduleGraph.getModuleById(
           path.posix.join(srcDir, relativePath)
         )