v1.1.1 — docs/ 退出仓库，README 只讲当前版本

Changed

• The gallery images moved from docs/media/ to assets/, and docs/ is no longer
  tracked. The wiki-style documents under docs/ were internal working notes; they are
  not part of the library and are no longer published. No code, no public API and no
  observation/sensor behaviour changed in this release.
• Both READMEs now describe only the current release. The migration notes, the
  "0.1.x line vs 1.x line" comparisons and the "since 1.1.0" phrasing are gone; every
  statement is present-tense so the text does not rot with each release. Version numbers
  live in pyproject.toml and in this changelog, not in the README prose.