feat: surface cached token counts in /status output (openclaw#21248) thanks @vishaltandale00

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: vishaltandale00 <9222298+vishaltandale00@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/commands/status.types.ts

@@ -17,6 +17,8 @@ export type SessionStatus = {
   outputTokens?: number;
   totalTokens: number | null;
   totalTokensFresh: boolean;
+  cacheRead?: number;
+  cacheWrite?: number;
   remainingTokens: number | null;
   percentUsed: number | null;
   model: string | null;