feat: harden support, localize knowledge and add operator availability [skip ci]

Source-only publication of reviewed commit 64e96a7f423673dc29ad56485be9fc79bce8af1c.

Passed in isolation: focused frontend/backend tests, race checks, TypeScript typecheck, lint, Go compilation, Flowgram build, and deterministic SDK build/tests.

Not accepted as a production release: Next.js export/native assembly remains blocked by environment memory limits; browser interaction and MySQL staging acceptance remain unverified. No production server, database/schema, runtime configuration, deployment, release tag, or workflow execution was performed.

Expected source tree: 0a4a7528e9.

web/app/(dashboard)/dashboard/knowledge/page.tsx

@@ -1,3 +1,4 @@
+// Modified in the independent AgentDesk fork: localized knowledge workflows and safe display errors.
 "use client"
 
 import { CircleHelpIcon, FileTextIcon, RefreshCwIcon } from "lucide-react"
@@ -19,6 +20,7 @@ import {
 } from "@/lib/api/admin"
 import { KnowledgeBaseType, Status } from "@/lib/generated/enums"
 import { useI18n } from "@/i18n/provider"
+import { getKnowledgeTypeLabel, getKnowledgeStatusLabel } from "@/lib/knowledge-i18n"
 import { formatDateTime } from "@/lib/utils"
 
 export default function DashboardKnowledgePage() {
@@ -83,7 +85,7 @@ export default function DashboardKnowledgePage() {
         {
           key: "type",
           label: t("knowledge.columnType"),
-          render: (item) => <Badge variant="outline">{item.knowledgeTypeName}</Badge>,
+          render: (item) => <Badge variant="outline">{getKnowledgeTypeLabel(item.knowledgeType, t)}</Badge>,
         },
         {
           key: "contentCount",
@@ -101,7 +103,7 @@ export default function DashboardKnowledgePage() {
           label: t("knowledge.columnStatus"),
           render: (item) => (
             <Badge variant={item.status === Status.Ok ? "secondary" : "outline"}>
-              {item.statusName}
+              {getKnowledgeStatusLabel(item.status, t)}
             </Badge>
           ),
         },
@@ -131,7 +133,7 @@ export default function DashboardKnowledgePage() {
       rowActions={[
         {
           key: "rebuild-index",
-          label: (item) => t("knowledge.rebuildIndex"),
+          label: () => t("knowledge.rebuildIndex"),
           icon: <RefreshCwIcon />,
           run: async ({ item }) => {
             await rebuildKnowledgeBaseIndex(item.id)