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/alerts.ts

@@ -46,7 +46,7 @@ export const list = query({
     let items = await ctx.db
       .query("alerts")
       .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-      .collect()
+      .take(100)
     if (companyId) items = items.filter((a) => a.companyId === companyId)
     if (typeof start === "number") items = items.filter((a) => a.createdAt >= start)
     if (typeof end === "number") items = items.filter((a) => a.createdAt < end)
@@ -62,7 +62,7 @@ export const managersForCompany = query({
     const users = await ctx.db
       .query("users")
       .withIndex("by_tenant_company", (q) => q.eq("tenantId", tenantId).eq("companyId", companyId))
-      .collect()
+      .take(100)
     return users.filter((u) => (u.role ?? "").toUpperCase() === "MANAGER")
   },
 })
@@ -78,7 +78,7 @@ export const lastForCompanyBySlug = query({
     const items = await ctx.db
       .query("alerts")
       .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-      .collect()
+      .take(100)
     const matches = items.filter((a) => a.companyId === company._id)
     if (matches.length === 0) return null
     const last = matches.sort((a, b) => b.createdAt - a.createdAt)[0]
@@ -94,12 +94,15 @@ export const lastForCompaniesBySlugs = query({
     const alerts = await ctx.db
       .query("alerts")
       .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
-      .collect()
+      .take(100)
+    // Buscar todas as companies do tenant de uma vez
+    const allCompanies = await ctx.db
+      .query("companies")
+      .withIndex("by_tenant", (q) => q.eq("tenantId", tenantId))
+      .take(1000)
+    const companiesBySlug = new Map(allCompanies.map(c => [c.slug, c]))
     for (const slug of slugs) {
-      const company = await ctx.db
-        .query("companies")
-        .withIndex("by_tenant_slug", (q) => q.eq("tenantId", tenantId).eq("slug", slug))
-        .first()
+      const company = companiesBySlug.get(slug)
       if (!company) {
         result[slug] = null
         continue