feat: add multilingual Knowledge API support and fix docs.json

- Add Chinese (zh-hans) Knowledge API specification file
- Add Japanese (ja-jp) Knowledge API specification file
- Register Knowledge API in Chinese and Japanese API Access tabs
- Fix missing comma syntax error in docs.json line 394

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs.json

@@ -1287,6 +1287,10 @@
                             {
                                 "group": "文本生成",
                                 "openapi": "zh-hans/openapi_completion.json"
+                            },
+                            {
+                                "group": "知识库 API",
+                                "openapi": "zh-hans/openapi_knowledge.json"
                             }
                         ]
                     },
@@ -1922,6 +1926,10 @@
                             {
                                 "group": "テキスト ジェネレーター",
                                 "openapi": "ja-jp/openapi_completion.json"
+                            },
+                            {
+                                "group": "ナレッジベース API",
+                                "openapi": "ja-jp/openapi_knowledge.json"
                             }
                         ]
                     },