fix(dashboard): project-scope Command Center analytics (FUX-037)

Apply FUX-037 projectId scoping to Command Center and Reliability view.

packages/dashboard/app/api/legacy.ts

@@ -6254,7 +6254,7 @@ export interface AgentPromptSizePoint {
   totalChars: number;
 }
 
-function withProjectId(path: string, projectId?: string): string {
+export function withProjectId(path: string, projectId?: string): string {
   if (!projectId) return path;
   const separator = path.includes("?") ? "&" : "?";
   return `${path}${separator}projectId=${encodeURIComponent(projectId)}`;