feat: external knowledge bases (#1783)

* Initial plan

* Add backend support for external knowledge bases

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

* Add frontend support for external knowledge bases with tabs UI

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

* Add i18n translations for all languages (Traditional Chinese and Japanese)

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

* Update knowledge base tab list styling to match plugins page

Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>

* perf: margin-top for kb page

* refactor: switch RetrievalResultEntry to langbot_plugin pkg ones

* feat: knowledge retriever listing and creating

* stash

* refactor: unify sync mechanism for polymorphic components

* feat: use unified retireval result struct in retrieval test page

* chore: remove unused methods

* feat: retriever icon displaying

* feat: localagent retrieval with external kbs

* chore: bump version of langbot-plugin to 0.2.0b1

* fix: i18n

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: RockChinQ <45992437+RockChinQ@users.noreply.github.com>
Co-authored-by: Junyan Qin <rockchinq@gmail.com>

web/src/i18n/locales/zh-Hans.ts

@@ -564,6 +564,15 @@ const zhHans = {
     fileName: '文件名',
     noResults: '暂无结果',
     retrieveError: '检索失败',
+    builtIn: '内置',
+    external: '外部知识库',
+    addExternal: '添加外部知识库',
+    createExternalSuccess: '外部知识库创建成功',
+    updateExternalSuccess: '外部知识库更新成功',
+    deleteExternalSuccess: '外部知识库删除成功',
+    retriever: '检索器',
+    selectRetriever: '选择一个检索器...',
+    retrieverConfiguration: '检索器配置',
   },
   register: {
     title: '初始化 LangBot 👋',