feat(hono): re-export honoMiddleware from astro, aws-serverless, google-cloud-serverless

These SDKs already re-export the server-side integration surface (incl.
`honoIntegration`); add `honoMiddleware` alongside so users of those SDKs can
manually instrument a Hono app where automatic constructor-channel
instrumentation can't run.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RaYGdTstWVZKU9X4NjtYV1

Author: mydea

packages/astro/src/index.server.ts

@@ -73,6 +73,7 @@ export {
   isEnabled,
   kafkaIntegration,
   honoIntegration,
+  honoMiddleware,
   koaIntegration,
   knexIntegration,
   lastEventId,

packages/aws-serverless/src/index.ts

@@ -102,6 +102,7 @@ export {
   // oxlint-disable-next-line typescript/no-deprecated
   setupExpressErrorHandler,
   honoIntegration,
+  honoMiddleware,
   koaIntegration,
   // oxlint-disable-next-line typescript/no-deprecated
   setupKoaErrorHandler,

packages/google-cloud-serverless/src/index.ts

@@ -103,6 +103,7 @@ export {
   // oxlint-disable-next-line typescript/no-deprecated
   setupExpressErrorHandler,
   honoIntegration,
+  honoMiddleware,
   koaIntegration,
   // oxlint-disable-next-line typescript/no-deprecated
   setupKoaErrorHandler,