knotserver, knotmirror: fix language detection accuracy and timeouts

- Increases language analysis HTTP timeouts from 1s to 5s (and 10s for post-receive hooks) to prevent context cancellation on larger repositories. - Implements a 10,000 file cap in AnalyzeLanguages to prevent I/O starvation on massive monorepos. - Excludes enry.Unknown files from language calculations to prevent huge asset files (like Godot .tscn/.tres) from completely washing out the true code languages. Signed-off-by: atixnotfound.tngl.sh <atsharma623@gmail.com>