feat: 增强 AI-Core 文档解析器

- 添加 VLM 客户端支持
- 优化解析器配置
- 添加配置示例文件
- 生成新的 gRPC protobuf 文件

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ai-core/service/grpc_server.py

@@ -75,6 +75,21 @@ class DocumentParserServicer:
                     content_length=0,
                 )
 
+            # 提取 VLM 配置
+            vlm_config = None
+            if hasattr(request, 'vlm_config') and request.vlm_config:
+                vlm_cfg = request.vlm_config
+                if vlm_cfg.enabled:
+                    vlm_config = {
+                        "enabled": vlm_cfg.enabled,
+                        "provider": vlm_cfg.provider,
+                        "model": vlm_cfg.model,
+                        "api_key": vlm_cfg.api_key,
+                        "base_url": vlm_cfg.base_url,
+                        "prompt": vlm_cfg.prompt,
+                    }
+                    logger.info(f"VLM config: provider={vlm_cfg.provider}, model={vlm_cfg.model}")
+
             logger.info("Downloading file from URL: %s", file_url)
 
             try:
@@ -95,9 +110,9 @@ class DocumentParserServicer:
                     content_length=0,
                 )
 
-            logger.info("Parsing file with MarkItDown")
+            logger.info("Parsing file with MarkItDown + VLM")
 
-            result = self.parser.parse_bytes(content, file_name)
+            result = self.parser.parse_bytes(content, file_name, vlm_config=vlm_config)
 
             if not result.get("success", False):
                 logger.warning("Parser returned failure: %s", result.get("error", "Unknown error"))