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

sdks/go/cmd/elydora/plugins/cline.go

@@ -7,8 +7,7 @@ type ClinePlugin struct {
 	rename renameFunc
 }
 
-// ManagesGuardRuntime reports that Cline commits both generated runtimes and
-// both native hook files in one transaction.
+// ManagesGuardRuntime reports that the guard is committed with the audit runtime.
 func (p *ClinePlugin) ManagesGuardRuntime() bool {
 	return true
 }