Fix C# browser automation CLI on Windows

[Jiahui-Gu]

Summary

• invoke the Playwright npm JavaScript entry point directly with Node.js on Windows
• pass each CLI argument without shell parsing so CDP query parameters and access tokens remain intact
• document the complete local azd environment, startup, readiness, and representative browser invocation path

Verification

• built the .NET 10 sample
• started the repaired branch locally with an explicit fresh azd environment
• verified readiness and a representative browser navigation on the assigned local port
• observed browser session creation, goto, snapshot, and Example Domain title/heading