feat: harden support, localize knowledge and add operator availability [skip ci]

Source-only publication of reviewed commit 64e96a7f423673dc29ad56485be9fc79bce8af1c.

Passed in isolation: focused frontend/backend tests, race checks, TypeScript typecheck, lint, Go compilation, Flowgram build, and deterministic SDK build/tests.

Not accepted as a production release: Next.js export/native assembly remains blocked by environment memory limits; browser interaction and MySQL staging acceptance remain unverified. No production server, database/schema, runtime configuration, deployment, release tag, or workflow execution was performed.

Expected source tree: 0a4a7528e9.

internal/pkg/enums/agent.go

@@ -1,3 +1,4 @@
+// Modified in AgentDeskNext: authenticated support availability and calendars.
 package enums
 
 type AgentRunResolutionStatus string
@@ -31,18 +32,27 @@ var AgentRunEvidenceStatusValues = []AgentRunEvidenceStatus{
 type ServiceStatus int
 
 const (
-	ServiceStatusIdle ServiceStatus = 0
-	ServiceStatusBusy ServiceStatus = 1
+	ServiceStatusIdle        ServiceStatus = 0
+	ServiceStatusBusy        ServiceStatus = 1
+	ServiceStatusBreak       ServiceStatus = 2
+	ServiceStatusUnavailable ServiceStatus = 3
+	ServiceStatusVacation    ServiceStatus = 4
 )
 
 var ServiceStatusValues = []ServiceStatus{
 	ServiceStatusIdle,
 	ServiceStatusBusy,
+	ServiceStatusBreak,
+	ServiceStatusUnavailable,
+	ServiceStatusVacation,
 }
 
 var serviceStatusLabelMap = map[ServiceStatus]string{
-	ServiceStatusIdle: "空闲",
-	ServiceStatusBusy: "忙碌",
+	ServiceStatusIdle:        "空闲",
+	ServiceStatusBusy:        "忙碌",
+	ServiceStatusBreak:       "休息",
+	ServiceStatusUnavailable: "不可用",
+	ServiceStatusVacation:    "休假",
 }
 
 func IsValidServiceStatus(status ServiceStatus) bool {