fix(fetch): preserve port when matching noProxy patterns (#13366)

[patrickswedish]

Summary

Preserves the URL port during noProxy evaluation in fetchwithRequestOptions so port-specific proxy bypass rules (such as 127.0.0.1:11434 or localhost:11434) correctly match and bypass the configured proxy.

Changes

• In packages/fetch/src/fetch.ts, normalize url.hostname (preserving any port on url.host) and pass url.host (and originalHost) to shouldBypassProxy.
• In packages/fetch/src/util.test.ts, add unit tests verifying port discrimination for IP and localhost noProxy rules.

Fixes #13366

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