v0.1.0 — first release

dsh-chem v0.1.0

English: First release of the deterministic chemistry math toolbox — 4 zero-dependency tools:

• formula_mass — chemical formula parsing (nested parens, hydrates, ionic charges, coefficients) + IUPAC molar mass with per-element breakdown
• mass_moles — mass/mole/particle conversions (Avogadro 6.02214076e23), 6 modes
• solution — molarity, preparation mass, C1V1=C2V2 dilution, percent solutions (w/v, v/v, mass)
• ph — pH/pOH/[H+]/[OH-] conversions + Henderson-Hasselbalch buffers

102 tests, all anchors from an independent Python oracle cross-validated against published textbook molar masses.

中文：化学计量数学工具箱首发——化学式解析与摩尔质量、质量/摩尔/粒子换算、溶液浓度（摩尔浓度/稀释/百分比）、pH 与缓冲溶液，四工具零依赖，102 测试全绿（锚点独立 Python oracle + 教科书值交叉验证）。