Fix incorrect params typing

[evshank]

What changed? Why?
Fixed incorrect TypeScript typing of params in the Generate Dynamic Embed Images guide.

Originally, params was typed as a Promise<{ username: string }> and accessed using await params, which does not match the Next.js App Router API. In Next.js App Router:

• params is always a synchronous object
• is not a Promise
• its type is { username: string } in these examples

The incorrect typing caused TypeScript errors (TS2741: Property 'username' is missing in type 'Promise<{ username: string; }>' but required in type '{ username: string; }') in the API route, generateMetadata, and page components.

All examples have now been updated to:

• type params correctly as { username: string }
• remove await
• access values directly via params.username

This ensures the examples compile cleanly in TypeScript and align with the Next.js App Router contract.

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Notes to reviewers

N/A

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How has it been tested?

Verified that TypeScript compilation passes with no errors (tsc --noEmit)

[cb-heimdall]

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[evshank]

@roethke @youssefea Guys, can you take a look at this?