refactor(convex): separar heartbeat em tabela dedicada para evitar OOM

- Criar tabela machineHeartbeats para armazenar lastHeartbeatAt separadamente
- Modificar heartbeat para so atualizar machines quando ha mudancas reais
- Atualizar queries listByTenant e getById para usar nova tabela
- Reducao drastica de versoes de documentos criadas a cada heartbeat

Antes: ~54 versoes por maquina (3524 linhas para 65 maquinas)
Agora: heartbeat atualiza documento leve, machines so muda com dados novos

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

convex/_generated/api.d.ts

@@ -49,14 +49,6 @@ import type {
   FunctionReference,
 } from "convex/server";
 
-/**
- * A utility for referencing Convex functions in your app's API.
- *
- * Usage:
- * ```js
- * const myFunctionReference = api.myModule.myFunction;
- * ```
- */
 declare const fullApi: ApiFromModules<{
   alerts: typeof alerts;
   bootstrap: typeof bootstrap;
@@ -93,14 +85,30 @@ declare const fullApi: ApiFromModules<{
   usbPolicy: typeof usbPolicy;
   users: typeof users;
 }>;
-declare const fullApiWithMounts: typeof fullApi;
 
+/**
+ * A utility for referencing Convex functions in your app's public API.
+ *
+ * Usage:
+ * ```js
+ * const myFunctionReference = api.myModule.myFunction;
+ * ```
+ */
 export declare const api: FilterApi<
-  typeof fullApiWithMounts,
+  typeof fullApi,
   FunctionReference<any, "public">
 >;
+
+/**
+ * A utility for referencing Convex functions in your app's internal API.
+ *
+ * Usage:
+ * ```js
+ * const myFunctionReference = internal.myModule.myFunction;
+ * ```
+ */
 export declare const internal: FilterApi<
-  typeof fullApiWithMounts,
+  typeof fullApi,
   FunctionReference<any, "internal">
 >;