fix(convex): corrigir memory leak com .collect() sem limite e adicionar otimizacoes

Problema: Convex backend consumindo 16GB+ de RAM causando OOM kills

Correcoes aplicadas:
- Substituido todos os .collect() por .take(LIMIT) em 27+ arquivos
- Adicionado indice by_usbPolicyStatus para otimizar query de maquinas
- Corrigido N+1 problem em alerts.ts usando Map lookup
- Corrigido full table scan em usbPolicy.ts
- Corrigido subscription leaks no frontend (tickets-view, use-ticket-categories)
- Atualizado versao do Convex backend para precompiled-2025-12-04-cc6af4c

Arquivos principais modificados:
- convex/*.ts - limites em todas as queries .collect()
- convex/schema.ts - novo indice by_usbPolicyStatus
- convex/alerts.ts - N+1 fix com Map
- convex/usbPolicy.ts - uso do novo indice
- src/components/tickets/tickets-view.tsx - skip condicional
- src/hooks/use-ticket-categories.ts - skip condicional

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

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

convex/teams.ts

@@ -28,17 +28,17 @@ export const list = query({
     const teams = await ctx.db
       .query("teams")
       .withIndex("by_tenant_name", (q) => q.eq("tenantId", tenantId))
-      .collect();
+      .take(50);
 
     const users = await ctx.db
       .query("users")
       .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-      .collect();
+      .take(50);
 
     const queues = await ctx.db
       .query("queues")
       .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-      .collect();
+      .take(50);
 
     return teams.map((team) => {
       const members = users
@@ -111,7 +111,7 @@ export const update = mutation({
       const users = await ctx.db
         .query("users")
         .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-        .collect();
+        .take(50);
 
       const now = users
         .filter((user) => (user.teams ?? []).includes(team.name))
@@ -150,7 +150,7 @@ export const remove = mutation({
     const users = await ctx.db
       .query("users")
       .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-      .collect();
+      .take(50);
 
     await Promise.all(
       users
@@ -182,7 +182,7 @@ export const setMembers = mutation({
     const users = await ctx.db
       .query("users")
       .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-      .collect();
+      .take(50);
     const tenantUserIds = new Set(users.map((user) => user._id));
     for (const memberId of memberIds) {
       if (!tenantUserIds.has(memberId)) {
@@ -218,7 +218,7 @@ export const directory = query({
     const users = await ctx.db
       .query("users")
       .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-      .collect();
+      .take(50);
 
     return users.map((user) => ({
       id: user._id,