Add equipment loan feature and USB bulk control

- Add emprestimos (equipment loan) module in Convex with queries/mutations
- Create emprestimos page with full CRUD and status tracking
- Add USB bulk control to admin devices overview
- Fix Portuguese accents in USB policy control component
- Fix dead code warnings in Rust agent
- Fix tiptap type error in rich text editor

convex/schema.ts

@@ -767,4 +767,68 @@ export default defineSchema({
     _ttl: v.optional(v.number()),
   })
     .index("by_key", ["tenantId", "cacheKey"]),
+
+  // ================================
+  // Emprestimo de Equipamentos
+  // ================================
+  emprestimos: defineTable({
+    tenantId: v.string(),
+    reference: v.number(),
+    clienteId: v.id("companies"),
+    clienteSnapshot: v.object({
+      name: v.string(),
+      slug: v.optional(v.string()),
+    }),
+    responsavelNome: v.string(),
+    responsavelContato: v.optional(v.string()),
+    tecnicoId: v.id("users"),
+    tecnicoSnapshot: v.object({
+      name: v.string(),
+      email: v.optional(v.string()),
+    }),
+    equipamentos: v.array(v.object({
+      id: v.string(),
+      tipo: v.string(),
+      marca: v.string(),
+      modelo: v.string(),
+      serialNumber: v.optional(v.string()),
+      patrimonio: v.optional(v.string()),
+    })),
+    quantidade: v.number(),
+    valor: v.optional(v.number()),
+    dataEmprestimo: v.number(),
+    dataFimPrevisto: v.number(),
+    dataDevolucao: v.optional(v.number()),
+    status: v.string(),
+    observacoes: v.optional(v.string()),
+    multaDiaria: v.optional(v.number()),
+    multaCalculada: v.optional(v.number()),
+    createdBy: v.id("users"),
+    updatedBy: v.optional(v.id("users")),
+    createdAt: v.number(),
+    updatedAt: v.number(),
+  })
+    .index("by_tenant", ["tenantId"])
+    .index("by_tenant_status", ["tenantId", "status"])
+    .index("by_tenant_cliente", ["tenantId", "clienteId"])
+    .index("by_tenant_tecnico", ["tenantId", "tecnicoId"])
+    .index("by_tenant_reference", ["tenantId", "reference"])
+    .index("by_tenant_created", ["tenantId", "createdAt"])
+    .index("by_tenant_data_fim", ["tenantId", "dataFimPrevisto"]),
+
+  emprestimoHistorico: defineTable({
+    tenantId: v.string(),
+    emprestimoId: v.id("emprestimos"),
+    tipo: v.string(),
+    descricao: v.string(),
+    alteracoes: v.optional(v.any()),
+    autorId: v.id("users"),
+    autorSnapshot: v.object({
+      name: v.string(),
+      email: v.optional(v.string()),
+    }),
+    createdAt: v.number(),
+  })
+    .index("by_emprestimo", ["emprestimoId"])
+    .index("by_emprestimo_created", ["emprestimoId", "createdAt"]),
 });