Refa: better UX for adding OCR model (#12034)

### What problem does this PR solve?

Better UX for adding OCR model.

### Type of change

- [x] Refactoring

web/src/locales/en.ts

@@ -1110,6 +1110,9 @@ Example: Virtual Hosted Style`,
       mcp: 'MCP',
       mineru: {
         modelNameRequired: 'Model name is required',
+        apiServerRequired: 'MinerU API Server Configuration is required',
+        serverUrlBackendLimit:
+          'MinerU Server URL Address is only available for the HTTP client backend',
         apiserver: 'MinerU API Server Configuration',
         outputDir: 'MinerU Output Directory Path',
         backend: 'MinerU Processing Backend Type',
@@ -1121,6 +1124,11 @@ Example: Virtual Hosted Style`,
           vlmTransformers: 'Vision Language Model with Transformers',
           vlmVllmEngine: 'Vision Language Model with vLLM Engine',
           vlmHttpClient: 'Vision Language Model via HTTP Client',
+          vlmMlxEngine: 'Vision Language Model with MLX Engine',
+          vlmVllmAsyncEngine:
+            'Vision Language Model with vLLM Async Engine (Experimental)',
+          vlmLmdeployEngine:
+            'Vision Language Model with LMDeploy Engine (Experimental)',
         },
       },
     },

web/src/locales/zh.ts

@@ -959,6 +959,8 @@ General：实体和关系提取提示来自 GitHub - microsoft/graphrag：基于
       mcp: 'MCP',
       mineru: {
         modelNameRequired: '模型名称为必填项',
+        apiServerRequired: 'MinerU API服务器配置为必填项',
+        serverUrlBackendLimit: '仅在backend 为vlm-http-client 时可填写',
         apiserver: 'MinerU API服务器配置',
         outputDir: 'MinerU输出目录路径',
         backend: 'MinerU处理后端类型',
@@ -970,6 +972,9 @@ General：实体和关系提取提示来自 GitHub - microsoft/graphrag：基于
           vlmTransformers: '基于Transformers的视觉语言模型',
           vlmVllmEngine: '基于vLLM引擎的视觉语言模型',
           vlmHttpClient: '通过HTTP客户端连接的视觉语言模型',
+          vlmMlxEngine: '基于MLX引擎的视觉语言模型',
+          vlmVllmAsyncEngine: '基于vLLM异步引擎的视觉语言模型（实验性）',
+          vlmLmdeployEngine: '基于LMDeploy引擎的视觉语言模型（实验性）',
         },
       },
     },