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/qwen.go

@@ -73,7 +73,7 @@ func (p *QwenPlugin) Uninstall(agentID string) error {
 	if err != nil {
 		return err
 	}
-	runtimeRoot, err := qwenRuntimeRoot()
+	runtimeRoot, err := AgentRuntimeRoot()
 	if err != nil {
 		return err
 	}
@@ -104,7 +104,7 @@ func (p *QwenPlugin) Status() (PluginStatus, error) {
 		return status, err
 	}
 	status.ConfigPath = sources.user.filePath
-	runtimeRoot, err := qwenRuntimeRoot()
+	runtimeRoot, err := AgentRuntimeRoot()
 	if err != nil {
 		return status, err
 	}