Stop documenting the web /logs/ URL — it no longer exists (#1440)

[jonfroehlich]

Fixes #1440. Docs-only (plus four comments/docstrings that repeated the same stale claim).

Problem

docs/DEPLOYMENT.md tells you to read logs at a web /logs/ URL. That route is gone — every documented path 404s on both hosts:

/logs/                 -> 404      /logs/httpd-access.log -> 404
/logs/debug.log        -> 404      /logs/debug.log.1      -> 404
/logs/buildlog.txt     -> 404

The response carries Server: gunicorn and Django's custom 404 template, so Apache has no /logs/ alias any more and the request falls through to Django. Not a permissions or missing-file problem — the route doesn't exist.

Found while verifying the #1283 deploy. Per @jonfroehlich, web log access is no longer wanted and UW CSE IT has trouble maintaining it, so the fix is to stop documenting it rather than restore it.

Changes

• DEPLOYMENT.md: rewrote the log-locations table and replaced "Accessing Logs via Web" with "Reading debug.log over SSH". buildlog.txt is now honestly described as reachable only via the deploy email; the httpd-*.log files as not reachable without CSE IT.
• DEPLOYMENT.md: two "verify the deploy via the build log" steps linked to URLs that 404. They now point at /version.json — and say to match git_sha, not built_at.
• CLAUDE.md, settings.py, version.py, test docstring: the same claim appeared in four more places, several as the stated reason the log must live inside MEDIA_ROOT. That constraint is still real, but the reason isn't the web URL — media/ is the tree bind-mounted to the shared CSE filesystem, so living inside it is what makes debug.log readable over SSH at all. With no shell on these hosts, a log written anywhere else is a log nobody can read.

MEDIA_ROOT is still a web-served tree, so the INFO-not-DEBUG conservatism stays — now stated on its own terms instead of resting on /logs/.

Also cross-references #1439 where the docs tell you to check debug.log.1: rotation is unreliable under multiple Gunicorn workers, so a rotated file may be far smaller than 5 MB and missing records.

Verification

• All 5 /logs/ paths curl-tested against both hosts.
• grep -rn '/logs/' across the repo — every surviving mention now says it's gone.
• 724 tests pass.

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