feat(heal): add progress and trace observability (#6179)

* feat(heal): track erasure set progress baseline

Record erasure-set heal byte progress from per-object results and seed progress totals from complete usage-cache snapshots when available.

Keep usage-cache failures observational so heal execution continues without a baseline.

Co-Authored-By: heihutu <heihutu@gmail.com>

* feat(heal): skip filtered erasure set versions

Skip erasure-set versions written after the durable heal start time, and queue lifecycle-expired versions for expiry before skipping them.

Track new-version and ILM-expired skips separately so progress can explain completed baseline work without treating these skips as retry-blocking failures.

Co-Authored-By: heihutu <heihutu@gmail.com>

* feat(heal): wire abandoned data-dir cleanup check

Connect check_abandoned_parts through ECStore, pool, and set layers so heal can invoke the existing orphan data-dir reclaim path instead of returning NotImplemented.

Add dry-run support to the reclaim scan and cover dry-run plus scoped set behavior with regression tests.

Co-Authored-By: heihutu <heihutu@gmail.com>

* feat(obs): add heal scanner trace bus

Introduce an in-process broadcast trace bus with typed heal and scanner events, lazy event construction, and bounded lagged-subscriber behavior.

Cover zero-subscriber publishing, subscription delivery, drop accounting, and lagged receivers with focused common-crate tests.

Co-Authored-By: heihutu <heihutu@gmail.com>

* feat(obs): stream heal trace events from admin API

Wire the admin trace endpoint to the common trace bus for heal/scanner events, including kind, regex, and threshold filtering.

Co-Authored-By: heihutu <heihutu@gmail.com>

* feat(obs): emit heal trace events

Publish heal task lifecycle and abandoned-parts cleanup events through the common trace bus so the admin trace stream has live heal diagnostics.

Co-Authored-By: heihutu <heihutu@gmail.com>

* feat(obs): emit scanner trace events

Publish scanner folder, lifecycle action, and heal-candidate events through the common trace bus for live admin scanner diagnostics.

Co-Authored-By: heihutu <heihutu@gmail.com>

* fix(heal): route data usage loader through storage api

Keep ECStore data-usage facade access behind the heal storage_api boundary so architecture migration guards can validate the heal progress path.

Co-Authored-By: heihutu <heihutu@gmail.com>

* perf(heal): avoid lifecycle snapshots on ordinary heal pages

Only request lifecycle object snapshots when the heal pass has lifecycle expiry context. This keeps ordinary listing and disk-walk pages from cloning FileInfo/ObjectInfo payloads while preserving the skip path that queues expired versions.

Co-Authored-By: heihutu <heihutu@gmail.com>

* test(heal): update bug-fix mocks for lifecycle snapshots

Carry the lifecycle snapshot opt-in argument through the remaining heal bug-fix test mocks so all-targets clippy covers the updated storage trait.

Co-Authored-By: heihutu <heihutu@gmail.com>

* test(rustfs): sync heal storage mock signature

Update the rustfs storage RPC test mock for the lifecycle snapshot opt-in argument and cover it with rustfs all-targets clippy.

Co-Authored-By: heihutu <heihutu@gmail.com>

* test(e2e): allocate smoke ports across nextest processes

Serialize E2E port selection with a small /tmp allocator so nextest workers do not reuse the same just-released ephemeral port before RustFS binds it.

Co-Authored-By: heihutu <heihutu@gmail.com>

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Co-authored-by: heihutu <heihutu@gmail.com>

Cargo.lock

@@ -9280,6 +9280,7 @@ dependencies = [
  "s3s",
  "serde",
  "serde_json",
+ "smallvec",
  "tokio",
  "tonic",
  "tracing",