fix: skip dynamic bazaar import when extension is pre-registered

[sragss]

Background
The @x402/next (and other HTTP middleware) packages use dynamic imports with /* webpackIgnore: true */ for the bazaar extension:

bazaarPromise = import(/* webpackIgnore: true */ "@x402/extensions/bazaar")

This fails on serverless platforms (e.g., Vercel) because:

1. webpackIgnore tells the bundler to resolve the module at runtime
2. Serverless functions only have access to bundled code, not node_modules
3. The dynamic import fails with ERR_MODULE_NOT_FOUND

From Vercel:

Failed to load bazaar extension: Error: Cannot find package '@x402/extensions' imported from /var/task/.next/server/chunks/_453aea9d._.js
    at ignore-listed frames {
  code: 'ERR_MODULE_NOT_FOUND'
}

Solution
Update all HTTP middleware packages (next, express, hono) to skip the dynamic import when the extension is pre-registered

Users on serverless platforms can now pre-register the bazaar extension using a static import:

import { bazaarResourceServerExtension } from "@x402/extensions/bazaar"

const server = new x402ResourceServer(facilitator)
server.registerExtension(bazaarResourceServerExtension)

• Static imports are bundled correctly
• hasExtension("bazaar") returns true
• Dynamic import is skipped entirely
• No runtime errors

Users on traditional servers (where node_modules is available) see no change in behavior.

[cb-heimdall]

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[vercel]

@sragss is attempting to deploy a commit to the Coinbase Team on Vercel.

A member of the Team first needs to authorize it.

[phdargen]

Great catch @sragss and thanks a lot for the fix!