feat(fleet): FleetService Connect API for the Fleet Manager

[Bugs5382]

Summary

Add cryptos.fleet.v1.FleetService — the Connect (gRPC-web) API the Fleet Manager web UI calls, backed by the manager which fans out to nodes over gRPC/mTLS. Read-only RPCs for this phase: ListNodes, GetNode, ListCertificates, ListProfiles, ListAdapters, ListAudit, ListEnrollments. Generate the Connect Go server + TypeScript client.

Acceptance criteria

• FleetService proto with the read RPCs above.
• buf generates Connect Go + TS output.
• Pre-commit AI-tell scan no longer false-positives on generated connect-go boilerplate.

Notes

First of three (api -> manager -> web).