Release RustQueue 0.9.0: Topic TTL discard

[SamuelSupe]

Summary

• add Topic-level TTL_DISCARD with an absolute Broker-timestamp lifetime while keeping RELIABLE as the default
• expire unrouted, deferred, requeued, and in-flight messages without DLQ; persist expiration boundaries and keep Segment GC asynchronous
• add management API, CRD, Console create/configure flows, ownership fencing, metrics, logs, compatibility handling, and deadline-safe TCP writes
• update workspace, Console, Helm, README, architecture, operations, site, and release metadata for 0.9.0

Validation

• OrbStack Rust 1.88 workspace check, 410 tests, Clippy, Helm lint/template, and 7 fuzz targets
• Go/Python core and secure compatibility matrix on the 0.9.0 runtime image
• Console pnpm check (2 tests), production build, and local Chrome bilingual interaction validation
• ./scripts/verify-release-version.sh 0.9.0
• git diff --check

Environment note

The OrbStack Node container could not fetch pnpm supply-chain registry metadata because of the local certificate chain. The UI check/build therefore used the already locked local dependencies; the production runtime image and all Rust/compatibility work remained in OrbStack.