refactor: 重构 algorithm 为 ai-core 代码解析服务

- 新增 ai-core 目录，包含代码解析核心服务
- 添加 proto 定义、parser、service 模块
- 添加启动脚本和依赖配置

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

ai-core/main.py

@@ -0,0 +1,59 @@
+import argparse
+import logging
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(__file__))
+
+from service.grpc_server import serve
+
+DEFAULT_PORT = 50051
+DEFAULT_MAX_WORKERS = 10
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Document Parser gRPC Server (MarkItDown)",
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
+    )
+    parser.add_argument(
+        "--port",
+        type=int,
+        default=DEFAULT_PORT,
+        help="Port to listen on",
+    )
+    parser.add_argument(
+        "--max-workers",
+        type=int,
+        default=DEFAULT_MAX_WORKERS,
+        help="Maximum number of worker threads",
+    )
+    parser.add_argument(
+        "--log-level",
+        type=str,
+        default="INFO",
+        choices=["DEBUG", "INFO", "WARNING", "ERROR"],
+        help="Log level",
+    )
+    
+    args = parser.parse_args()
+
+    logging.basicConfig(
+        level=getattr(logging, args.log_level),
+        format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
+    )
+    
+    logger = logging.getLogger(__name__)
+    logger.info("Starting Document Parser gRPC Server (MarkItDown)")
+    logger.info("Port: %d", args.port)
+    logger.info("Max workers: %d", args.max_workers)
+    
+    try:
+        serve(port=args.port, max_workers=args.max_workers)
+    except KeyboardInterrupt:
+        logger.info("Server shutdown requested")
+    except Exception as e:
+        logger.error("Server error: %s", str(e), exc_info=True)
+        sys.exit(1)
+
+if __name__ == "__main__":
+    main()