feat: ddddocr-rs 完成 core/ort/tract2 规范整改与发布

准备

  - core：内置官方字符集（OLD/BETA）与 ModelMetadata::from_builtin_*
  构造器
  - ort：导出 Session、实现 Info、修正 cuda feature 接线、共享推理工具
  - tract2：包名更名（原 ddddocr-tract 已被占用）并完成规范整改
  - 集成测试按领域拆分（ocr / det / slide / common / api_surface）
  - 发布准备：Cargo.toml 元数据、workspace 版本 0.2.4、LICENSE/
  NOTICE、README 模型下载说明

ddddocr-tract2/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "ddddocr-tract2"
+version = { workspace = true }
+edition = { workspace = true }
+license = { workspace = true }
+description = "ddddocr-rs 的 Tract 推理引擎实现"
+keywords = ["ocr", "captcha", "ddddocr", "onnxruntime", "tract"]
+categories = ["multimedia::images", "computer-vision"]
+# repository = "https://github.com/<用户名>/<仓库名>"  # 发布前请补充
+readme = "../README.md"
+
+[dependencies]
+ddddocr-core = { path = "../ddddocr-core", version = "0.2.4" }
+tract-onnx = { workspace = true }
+tract-linalg = { workspace = true }
+ndarray = { workspace = true }
+image = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+anyhow = { workspace = true }
+thiserror = { workspace = true }
+tracing = { workspace = true }