container-cache: hf.conf still carries temporary debug changes

Describe the bug

deploy/helm/container-cache/deploy/files/hf.conf carries five commented-out
directives labelled as temporary debugging, present since the initial public
snapshot:

hf.conf:55   # Temporarily disable rate limiting to isolate 503 cause
hf.conf:56   # limit_req  zone=hf_rps burst=10 nodelay;
hf.conf:57   # limit_conn per_ip 8;
hf.conf:78   # access_by_lua_file /etc/nginx/conf.d/lua/lua-access.lua;
hf.conf:119  # access_by_lua_file /etc/nginx/conf.d/lua/lua-access.lua;
hf.conf:238  # access_by_lua_file /etc/nginx/conf.d/lua/lua-access.lua;

Two concrete consequences:

• nginx.conf:32 and nginx.conf:33 still allocate limit_req_zone hf_rps:10m
  and limit_conn_zone per_ip:10m. The only directives that referenced those
  zones are the commented-out lines above, so 20m of shared memory is reserved
  for zones nothing uses.
• All three hf.conf server blocks (huggingface.co,
  cas-server.xethub.hf.co, and ~^(.+\.)?hf\.co$) skip
  lua-access.lua, while ngc.conf:68 and proxy-cache.conf:132 run it.

This is not reported as an access-control hole: lua-access.lua documents itself
as S3 access control with presigned-URL verification, and the hf.co blocks proxy
to HuggingFace and isolate cache entries with $auth_hash instead. The point is
that a change described as temporary has been the committed state for months, so
the intended end state is unclear from the file.

Expected behavior

Either restore the directives, or delete them together with the now unused
hf_rps and per_ip zones and drop the "temporarily" wording. Both paths are
owner decisions, so no Pull Request is attached.

Start by reading deploy/helm/container-cache/deploy/files/hf.conf and the referenced nginx.conf, then compare the hf.co server blocks with ngc.conf:68 and proxy-cache.conf:132. The owner must decide whether to restore the commented directives or remove them with the unused zones and temporary wording; done means the chosen configuration is consistent across these files.