feat: 收口知识库分享链路

- 新增 shareKey 单参数 URL 分享页与失效页

- 新增知识库分享后端鉴权、审计与迁移脚本

- 在访问令牌中增加知识库分享授权入口

easyflow-ui-admin/app/src/locales/langs/en-US/documentCollectionSearch.json

@@ -12,6 +12,12 @@
     "save": "Save Configuration"
   },
   "engineHint": "The keyword search engine is controlled by platform-level configuration and is no longer configured per knowledge base.",
+  "retrievalModeTitle": "Retrieval Mode Guide",
+  "retrievalModeDescriptions": {
+    "hybrid": "Combines semantic vector recall with keyword matching for balanced default retrieval.",
+    "vector": "Focuses on semantic similarity and works better when query wording differs from the source text.",
+    "keyword": "Focuses on literal term matching and is suitable for precise lookups such as terms, IDs, and names."
+  },
   "message": {
     "saveSuccess": "Configuration saved successfully",
     "saveFailed": "Configuration saved failed"

easyflow-ui-admin/app/src/locales/langs/en-US/sysApiKey.json

@@ -14,5 +14,6 @@
     "failure": "Failure"
   },
   "permissions": "AuthInterface",
+  "knowledgeSharePermission": "Knowledge Share",
   "addApiKeyNotice": "This operation will generate an API key. Please confirm whether to proceed"
 }