git-server: cut cgit render time by enabling its response cache

cgit ran with cache-size=0 against scan-path over ~80 repos on NFS, so every
request reopened all of them to resolve the index age column. Measured 376ms
per index render, of which only ~50ms was CPU -- the rest was NFS wait. With
the cache enabled the same render takes ~19-29ms.

cache-root points at the existing node-local cgit-runtime emptyDir rather than
the NFS-backed /repos; caching onto NFS is what the old "permission issues"
comment was actually about. The startup script creates the directory since
cgit does not.

fcgiwrap ran as a single worker, so the 26 ArgoCD apps polling conf.git through
git-http-backend serialized against web UI renders; 4 concurrent requests
managed only ~1.5x the throughput of one. Preforking 4 workers separates them.

The cgit container also idled at 105m against a 250m limit and had accumulated
~2.9h of throttled time (nr_throttled 96979), so raise the ceiling and set the
request from measured idle usage.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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