⚡ Add AbortSignal.timeout() to Netlify fetch() calls missing timeouts

[kubestellar-hive]

Fixes #14057

Adds AbortSignal.timeout() to all fetch() calls in Netlify Functions that were missing timeouts, preventing hung requests from consuming function execution time.

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

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❌ Post-Merge Verification: failed

Commit: 7bc0177826d0438c428990dc17d06136575bf05f
Specs run: smoke.spec.ts
Report: https://github.com/kubestellar/console/actions/runs/25956910359

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Post-merge build verification passed ✅

Both Go and frontend builds compiled successfully against merge commit 7bc0177826d0438c428990dc17d06136575bf05f.