chore(oss): audit the server package and resync the SDK mirrors

Split the 657-line operation service into eor, submit, and verify
modules, add the AGENT_REVOKED and KEY_RETIRED codes the Backend already
emits, and condense every multi-line comment. Mirror Node, Python, and
Go at 2.1.0 with the deep-health 503, non-idempotent retry, rotation
grace, and path-encoding fixes. Document which routes and response
fields the self-hosted server does not provide.

Claude-Session: https://claude.ai/code/session_01Agoc9bRVE9KL7mmWtey9Vq

packages/server/src/services/audit-service.ts

@@ -1,10 +1,4 @@
-/**
- * Audit service — business logic for querying the tamper-evident audit log.
- *
- * Builds dynamic SQL queries with optional filters (org_id, agent_id,
- * operation_type, time range) and supports cursor-based pagination for
- * efficient traversal of large result sets.
- */
+/** Audit service: business logic for querying the tamper-evident audit log. */
 
 import type { Operation, AuditQueryRequest, AuditQueryResponse } from '../shared/index.js';
 import { DEFAULT_QUERY_LIMIT, MAX_QUERY_LIMIT } from '../shared/index.js';