feat: 导入 IRSTD 研究代码与文档（小目标检测）

- 新增 irstd 核心包、scripts、tests、configs
- 新增研究文档：literature_review / mathematical_analysis / novelty_matrix / experiment_plan / research_decision / research_log / manuscript_outline
- 新增 evidence、results 数据与审计产物
- 新增 pyproject.toml、requirements、.gitignore

pyproject.toml

@@ -0,0 +1,10 @@
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+[project]
+name = "irstd-risk-prototype"
+version = "0.1.0"
+requires-python = ">=3.11"
+dependencies = ["numpy==2.3.5", "scipy==1.17.0", "Pillow==12.3.0"]
+[tool.setuptools.packages.find]
+include = ["irstd*"]