dsh-econ-tools: DSH plugin for econometrics research

`dsh-econ-tools` is a DSH plugin maintained by Chaos-Hyper, licensed under the MIT License, and positioned as a comprehensive econometric research assistant. It aims to integrate scattered research steps into a continuous workflow, covering method guidance, data cleaning, variable selection, empirical analysis, robustness checks, and result reporting. Core functions include recommending models such as OLS, IV, and DID based on research questions; providing missing value handling and Python code snippets; supporting theoretical, data-driven, and machine learning variable selection; automatically generating multi-language code templates; performing seven-dimensional robustness analysis including parallel trends and placebo tests; and outputting statistical reports in both Chinese and English in Markdown or LaTeX formats. This plugin is suitable for developers and researchers using the DSH web environment via `dsh plu`.