fix(server): announce the bucket settings once at boot

[BryanFRD]

Closes #510

• The bucket, presign and cache warnings move out of backends into announce_storage, called from app next to announce_access, so a bucket deployment prints them once instead of once per backend construction.
• boot_log.rs drops the retry loop: one test on a current-thread runtime, so a broken capture now fails on the first pass (review of fix(server): announce the access settings once at boot #505).
• allowed reads is_set(value).then(...) instead of rewrapping the option (review of fix(config): warn about ignored access variables from their raw value #507).
• The Analog and Angular build group sets separateMajorMinor: false, so a minor of one that needs a major of the other still lands in one branch (review of chore(renovate): update Analog and the Angular build tooling together #509).

[ferrfleet]

Looks correct. The warnings and their conditions moved unchanged, cache.is_some() matches the old disk.is_some() since disk comes from cache, and the allowed rewrite behaves the same.

Nit: boot_log.rs still only tests the access warning on a volume config. A bucket config asserting that "objects and locks are stored in a bucket" shows up once would cover #510 directly.