Remove broker session rest

Reverts 062ec07 and 5eb0ea7: every firm's broker session stays logged in
around the clock again, renewing its token on the fixed timer as before.
The tree is back to 6dd2528's. A session_rest row left in settings is
unused.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

types.ts

@@ -174,9 +174,5 @@ export interface FirmState {
     firmId: string;
     firm: string;
     connected: boolean;
-    /** The broker session is logged out while nothing needs it (session rest,
-     *  lib/clients.ts): accounts show as last synced. wakeAt is when it logs
-     *  back in by itself, null when only trading starting will. */
-    resting?: { since: number; wakeAt: number | null };
     accounts: AccountState[];
 }