v1.1.1 — Star-Project Overhaul

• t21 — Sliding Mode Control: nonlinear robust control, chattering suppression

📖 Documentation Overhaul

• Bilingual README (中文 + English) with table of contents, quick start,
  prerequisites
• Collapsible tutorial details with learning path diagram
• Updated Simulink学习笔记.html covering all 21 lessons
• Academic CITATION.cff for easy referencing

🏗️ Project Structure

• .slx models moved to models/ — root directory now clean
• utils/getSimData.m — consolidated 6 duplicate functions into one shared utility
• GitHub community files: issue templates (bug/feature/tutorial request), PR template
• CODE_OF_CONDUCT.md, SECURITY.md, FUNDING.yml, dependabot.yml

🐛 Bug Fixes

• t19: LQR state feedback now uses correct A-BK closed-loop formula
• t19: H∞ visualization overhaul — envelope shading, DC-gain compensation,
  constraint violation highlighting
• t04: Fix broken Unicode escape (\x03B6 → ζ) causing garbled output
• t20: Guard quadprog/optimoptions with exist() for users without
  Optimization Toolbox
• t19, t20, t21: Wrap toolbox-dependent functions (ureal, hinfsyn, rms) in
  try-catch for graceful fallback
• t21, t13: Guard find() against empty results in convergence checks
• t16: Store and display gain/phase margin results (were previously discarded)
• t15: Fix incorrect "series complete" message (t16-t21 exist)
• t08: Correct outdated comment referencing Simscape
• t18: Remove dead no-op code
• t20: Remove dead A_pow computation loop

📦 Changelog (from v1.0.0)

Area	Changes
Tutorials	15 → 21 lessons
Documentation	Bilingual README, HTML notes, CITATION.cff
Community	Issue/PR templates, CoC, Security, FUNDING
Structure	models/, utils/, clean root directory
Bug fixes	13 issues resolved across t04-t21

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