docs: add documentation for wrangler login in containers

[petebacondarwin]

Summary

Adds a new section to the Wrangler login command documentation explaining how to configure OAuth login when running Wrangler inside a container.

This documents the use of --callback-host and --callback-port options for container environments where localhost inside the container is not accessible from the host machine's browser. The section explains:

• Why the standard login flow doesn't work in containers (localhost isolation)
• How to configure port mapping from host to container
• How to use --callback-host=0.0.0.0 to listen on all interfaces
• An example with custom port mapping using --callback-port

Related to: cloudflare/workers-sdk#9396

Requested by: @petebacondarwin

Link to Devin run: https://app.devin.ai/sessions/32f8502dad7e4b699e7048039209ab44

Updates since last revision

• Updated section content per @emily-shen's suggested rewrite
• Changed section title from "Docker container" to "container" for broader applicability
• Restructured to explain port mapping requirement first, then the callback-host option

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/workers/wrangler/	@cloudflare/wrangler, @irvinebroque, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://08de0a51.preview.developers.cloudflare.com
Preview Branch URL: https://devin-1768911328-wrangler-login-docker.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/workers/wrangler/commands/	https://devin-1768911328-wrangler-login-docker.preview.developers.cloudflare.com/workers/wrangler/commands/