merge feat/probe-b6: item 7 B1-B6 (probe collector, history, contract API, ping, themes, notify)

# Conflicts:
#	internal/agent/agent.go

internal/web/controller/api.go

@@ -194,6 +194,20 @@ func (a *APIController) initRouter(g *gin.RouterGroup) {
 	// never reach these.
 	agentAdmin := api.Group("/agent")
 	a.agentController.RegisterAdminRoutes(agentAdmin)
+	// Item 7 B3: probe metadata editing rides the same admin group
+	// (/panel/api/agent/probe-meta/:nodeId).
+	NewProbeMetaController(agentAdmin)
+	// Item 7 B4: probe task (latency target) management, same group
+	// (/panel/api/agent/probe-tasks*).
+	NewProbeTasksController(agentAdmin)
+
+	// Item 7 B5: theme store + public-surface settings, on the API
+	// group itself (/panel/api/probe/*).
+	NewProbeThemesController(api)
+
+	// Item 7 B6: notification settings + test send + cf-probe
+	// retirement coverage, same group (/panel/api/probe/notify*).
+	NewProbeNotifyController(api)
 
 	// Hosts API — per-inbound override endpoints for subscription links
 	hosts := api.Group("/hosts")