fix: server hooks not get when run onPrepare (#7802)

Author: caohuilin

packages/server/core/src/serverBase.ts

@@ -56,9 +56,9 @@ export class ServerBase<E extends Env = any> {
       handleSetupResult,
     });
     (serverContext as Record<string, any>).serverBase = this;
+    this.serverContext = serverContext as unknown as ServerContext;
     // need after serverContext to run onPrepare
     await serverContext.hooks.onPrepare.call();
-    this.serverContext = serverContext as unknown as ServerContext;
     this.#applyMiddlewares();
 
     return this;