feat: 初始化 ddddocr-rs 核心推理流程

- 实现基础 OCR 流水线：图片读取 -> 灰度化 -> 张量转换 -> 推理 -> CTC 解码
- 集成 `tract-onnx` 推理引擎，实现纯 Rust 运行环境
- 完善图片预处理逻辑（基于 Lanczos3 缩放与标准化处理）
- 添加 MIT 和 Apache-2.0 双重开源协议
- 完成初步的项目结构搭建与字符集（Charset）映射

LICENSE-MIT

@@ -0,0 +1,19 @@
+MIT License
+
+Copyright (c) 2026 CNWei
+Portions of this software are based on ddddocr, Copyright (c) 2021 sml2h3.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
+associated documentation files (the "Software"), to deal in the Software without restriction, including 
+without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
+copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the 
+following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial 
+portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT 
+LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO 
+EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 
+USE OR OTHER DEALINGS IN THE SOFTWARE.