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/lib/knowledge-i18n.test.mjs

@@ -1,3 +1,4 @@
+// Modified in the independent AgentDesk fork: localized knowledge workflows and safe display errors.
 import assert from "node:assert/strict"
 import test from "node:test"
 import ts from "typescript"
@@ -54,3 +55,27 @@ test("localizes knowledge retrieve enum labels from stable values", async () =>
   assert.equal(getKnowledgeAnswerStatusLabel(2, "\u65e0\u7b54\u6848", t), "No answer")
   assert.equal(getKnowledgeChunkProviderLabel("semantic", t), "Semantic chunks")
 })
+
+for (const locale of ["en-US", "ru-RU", "zh-CN"]) {
+  test(`knowledge labels and safe errors use ${locale} catalog, not server names`, async () => {
+    const helpers = await loadModule()
+    const catalog = JSON.parse(await readFile(new URL(`../messages/${locale}.json`, import.meta.url), "utf8"))
+    const translate = (key) => key.split(".").reduce((value, part) => value?.[part], catalog) ?? key
+    for (const [code, key] of [["document", "typeDocument"], ["faq", "typeFAQ"]]) {
+      assert.equal(helpers.getKnowledgeTypeLabel(code, translate), catalog.knowledge[key])
+    }
+    for (const [code, key] of [[0, "statusOk"], [1, "statusDisabled"], [2, "statusDeleted"]]) {
+      assert.equal(helpers.getKnowledgeStatusLabel(code, translate), catalog.knowledge[key])
+    }
+    for (const [code, key] of [["pending", "indexPending"], ["indexed", "indexIndexed"], ["failed", "indexFailed"]]) {
+      assert.equal(helpers.getKnowledgeIndexStatusLabel(code, translate), catalog.knowledge[key])
+    }
+    assert.equal(helpers.getKnowledgeStatusLabel(999, translate), catalog.knowledge.unknownStatus)
+    assert.equal(helpers.getKnowledgeTypeLabel("future", translate), catalog.knowledge.unknownType)
+    assert.equal(helpers.getKnowledgeIndexErrorLabel("SQL password=secret-example", translate), catalog.knowledge.indexFailureSummary)
+    assert.equal(helpers.getKnowledgeIndexErrorLabel("", translate), "")
+    for (const key of ["requestId", "rerank", "topScore", "promptTokens", "completionTokens", "traceData", "chunkNumber", "providerValue", "scoreValue", "rerankValue", "historyRecordedNotice"]) {
+      assert.ok(catalog.knowledge[key], `missing ${locale} knowledge.${key}`)
+    }
+  })
+}