Clean up dead Go code in handlers, pages, and stores

- Remove "chat" from surface disable guard (only admin needs it)
- Remove "chat" from IsSurfaceEnabled always-on check
- Remove unused fmt.Sprintf references in team stores
- Update stale comments referencing personas and chat surfaces

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/handlers/workflows.go

@@ -285,7 +285,7 @@ func (h *WorkflowHandler) Publish(c *gin.Context) {
 		stages = []models.WorkflowStage{}
 	}
 
-	// Snapshot includes persona tool grants at publish time (frozen for running instances)
+	// Snapshot stages at publish time (frozen for running instances)
 	type stageSnapshot struct {
 		models.WorkflowStage
 		ToolGrants []string `json:"tool_grants,omitempty"`