Adds a fourth auth tier alongside required/public/none. "app" is
functionally identical to "none" — no Authentik middleware attached —
but the distinct name records intent at the call site: this backend
has its own user login (NextAuth, Django, OAuth, bearer-token API,
etc.) and Authentik would only break it.
Why the new tier: with only required/none, every "the app has its
own auth so drop Authentik" decision looked identical at the call
site to "this is an OAuth callback / webhook receiver / native-client
API". Future readers couldn't tell whether a stack was intentionally
unauthenticated or relying on backend auth. Now they can.
Migrates the 8 stacks flipped earlier this session (novelapp, immich,
linkwarden, tandoor, freshrss, affine, actualbudget, ebooks/audiobookshelf)
from "none" to "app". Confirmed no-op: `tg plan` on novelapp showed
"No changes" — same middleware chain, same live state.
The variable description and the .claude/CLAUDE.md Auth section now
spell out the anti-exposure rule: only pick "app" or "none" AFTER
verifying the app has its own user auth ("app") or the endpoint is
intentionally public ("none"). Default stays "required" so accidental
omission fails closed.
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