fix(api): harden PoC seed submission and versions endpoint

### PoC Seed Stability

- Recover missed seed submissions after epoch-boundary lag and retry local seed restoration after transient failures (such as signer unavailability) to prevent validators from getting zeroed [`d1d6d03`](d1d6d03), [`ea13258`](ea13258), [`4601969`](4601969)

### API

- Fix: return `/v1/versions` with enriched DAPI version info (including ML node details) [`21ed5c6`](21ed5c6)
- Set default Node Manager gRPC port to 9400 to make sure it works on custom configurations [`6806e15`](6806e15)

### Deployments

- Update the default join stack configuration to use the latest `v0.2.15-post2` API image [`1c59f14`](1c59f14)

/v1/versions fixes

fix(devshardd): evict in-memory hosts on epoch prune (#1530)

Wire runtime-config OnEpochChange to phase, storage prune, EvictBefore,
and payload DropEpoch so DB retention and live hosts stay aligned. Move
pprof onto the admin listener and drop per-block epoch queries.

fix(devshardd): evict in-memory hosts on epoch prune (#1530)

Wire runtime-config OnEpochChange to phase, storage prune, EvictBefore,
and payload DropEpoch so DB retention and live hosts stay aligned. Move
pprof onto the admin listener and drop per-block epoch queries.

refactor(api): track seed submit cooldown by height only

seedAttemptEpoch is redundant: consecutive PoC windows are far more
than two blocks apart, so last-submit height alone throttles retries.

cleanup docker compose

0.2.15 cleanup

Merge remote-tracking branch 'origin/upgrade-v0.2.15' into gm/v0.2.15…

…-cleanup

# Conflicts:
#	inference-chain/app/upgrades/v0_2_15/upgrades.go
#	inference-chain/app/upgrades/v0_2_15/upgrades_test.go

Upgrade binary as param

Merge branch 'gm/validation-default' into gm/test-v0.2.15