refactor: comprehensive documentation optimization and workflow fixes

## Documentation Structure
- Move CLAUDE.md to docs/developers/claude-guide.md (standardized location)
- Move package.json, package-lock.json, book.json to docs/ subdirectory
- Delete DOCS.md (content consolidated into README.md)
- Add FAQ and troubleshooting guides (en/zh bilingual)
- Update gitbook-sync.md to reference README.md instead of deleted DOCS.md

## Workflow Fixes
- Fix all workflow branch references from 'main' to 'master'
- Update pages.yml sparse-checkout (remove DOCS.md, add npm cache path)
- Validate all YAML syntax passes

## Changelog Improvements
- Rename changelog files with consistent naming (YYYY-MM-DD-description.md)
- Add changelog/README.md with organized index
- Add CHANGELOG.md at root for quick reference
- Add 2026-04-15_readme-refactor-completion.md entry

## Example Modules
- Standardize all 5 example module READMEs with consistent format
- Add badges, contents tables, key concepts, and further reading

## Project Files
- Add .editorconfig for consistent coding style
- Add GitHub templates (issues, PR, security, code of conduct)
- Add scripts/ directory with build, test, format, setup helpers
- Reorganize tools/ to tools/performance/
- Update .gitignore with additional patterns

## Verification
- All SUMMARY.md links validated
- All workflow YAML syntax validated
- Bilingual docs (en/zh) synchronized

Author: LessUp

.editorconfig

@@ -0,0 +1,40 @@
+# EditorConfig for C++ High Performance Guide
+# https://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+# C++ source files
+[*.{cpp,hpp,h}]
+indent_style = space
+indent_size = 4
+max_line_length = 100
+
+# CMake files
+[{CMakeLists.txt,*.cmake}]
+indent_style = space
+indent_size = 4
+
+# YAML and JSON files
+[*.{yml,yaml,json}]
+indent_style = space
+indent_size = 2
+
+# Python and shell scripts
+[*.{py,sh}]
+indent_style = space
+indent_size = 4
+
+# Markdown files
+[*.md]
+trim_trailing_whitespace = false
+max_line_length = 80
+
+# Makefile
+[Makefile]
+indent_style = tab

.gitbook.yaml

@@ -1,4 +1,4 @@
 root: ./
 structure:
-  readme: DOCS.md
+  readme: README.md
   summary: SUMMARY.md

.github/CODE_OF_CONDUCT.md

@@ -0,0 +1,41 @@
+# Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity and
+orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior:
+
+* The use of sexualized language or imagery
+* Trolling, insulting/derogatory comments, and personal attacks
+* Public or private harassment
+* Publishing others' private information without permission
+* Other conduct which could reasonably be considered inappropriate
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at the project
+repository.
+
+All complaints will be reviewed and investigated promptly and fairly.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,39 @@
+name: Bug Report
+about: Create a report to help us improve
+title: "[Bug] "
+labels: [bug]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear description of the bug
+    validations:
+      required: true
+  
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to Reproduce
+      description: Steps to reproduce the behavior
+    validations:
+      required: true
+  
+  - type: input
+    id: os
+    attributes:
+      label: Operating System
+      placeholder: "e.g., Ubuntu 22.04"
+  
+  - type: input
+    id: compiler
+    attributes:
+      label: Compiler
+      placeholder: "e.g., GCC 11.4"
+  
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs
+      description: Relevant log output
+      render: shell

.github/ISSUE_TEMPLATE/docs_improvement.yml

@@ -0,0 +1,23 @@
+name: Documentation Improvement
+title: "[Docs] "
+labels: [documentation]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the documentation issue or improvement
+    validations:
+      required: true
+  
+  - type: input
+    id: location
+    attributes:
+      label: Location
+      description: Which file or section?
+  
+  - type: textarea
+    id: suggestion
+    attributes:
+      label: Suggested Improvement
+      description: How should it be improved?

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,24 @@
+name: Feature Request
+about: Suggest an idea for this project
+title: "[Feature] "
+labels: [enhancement]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the feature you'd like
+    validations:
+      required: true
+  
+  - type: textarea
+    id: motivation
+    attributes:
+      label: Motivation
+      description: Why is this feature needed?
+  
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives
+      description: Any alternative solutions you've considered

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,50 @@
+# Pull Request
+
+## Description
+
+Brief description of what this PR adds or fixes.
+
+## Type of Change
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature/example (non-breaking change which adds functionality)
+- [ ] Documentation update
+- [ ] Performance improvement
+- [ ] Code refactoring
+- [ ] Build/CI improvement
+
+## Checklist
+
+- [ ] My code follows the project's coding style (`.clang-format`)
+- [ ] I have tested my changes locally:
+  - [ ] Debug build: `cmake --preset=debug && cmake --build build/debug && ctest --preset=debug`
+  - [ ] Release build: `cmake --preset=release && cmake --build build/release && ctest --preset=release`
+- [ ] For code changes, I have run sanitizers:
+  - [ ] AddressSanitizer: `cmake --preset=asan && cmake --build build/asan && ctest --preset=asan`
+  - [ ] ThreadSanitizer (for concurrency code): `cmake --preset=tsan && cmake --build build/tsan && ctest --preset=tsan`
+  - [ ] UndefinedBehaviorSanitizer: `cmake --preset=ubsan && cmake --build build/ubsan && ctest --preset=ubsan`
+- [ ] I have updated the documentation accordingly (if applicable)
+- [ ] Both English and Chinese documentation are updated (if applicable)
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works (if applicable)
+
+## Testing Notes
+
+Describe how you tested your changes:
+
+- Build presets tested: 
+- Benchmark results (if applicable):
+- Platform/compiler:
+
+## Related Issues
+
+Fixes #(issue number)
+Related to #(issue number)
+
+## Screenshots (if applicable)
+
+Add screenshots to help explain your changes.
+
+---
+
+**Thank you for contributing to C++ High Performance Guide! 🚀**

.github/SECURITY.md

@@ -0,0 +1,21 @@
+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.0.x   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability in this project, please report it by
+creating a private security advisory through GitHub.
+
+We will respond to security reports within 48 hours and aim to release patches
+within 7 days for confirmed vulnerabilities.
+
+## Security Considerations
+
+This is an educational project focused on C++ performance optimization.
+The code examples are intended for learning purposes and may not include
+all production-ready security considerations.

.github/workflows/benchmark.yml

@@ -2,9 +2,9 @@ name: Benchmark
 
 on:
   push:
-    branches: [ main ]
+    branches: [ master ]
   pull_request:
-    branches: [ main ]
+    branches: [ master ]
 
 permissions:
   contents: read
@@ -70,7 +70,7 @@ jobs:
       uses: dawidd6/action-download-artifact@v3
       with:
         workflow: benchmark.yml
-        branch: main
+        branch: master
         name: benchmark-results
         path: baseline/
       continue-on-error: true
@@ -79,7 +79,7 @@ jobs:
       if: github.event_name == 'pull_request'
       run: |
         if [ -f baseline/memory_bench.json ] && [ -f memory_bench.json ]; then
-          python3 tools/analysis/benchmark_compare.py \
+          python3 tools/performance/benchmark_compare.py \
             baseline/memory_bench.json \
             memory_bench.json \
             --report memory_comparison.md \
@@ -94,7 +94,7 @@ jobs:
   benchmark-matrix:
     name: Benchmark on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
-    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    if: github.event_name == 'push' && github.ref == 'refs/heads/master'
 
     strategy:
       matrix:

.github/workflows/ci.yml

@@ -2,9 +2,9 @@ name: Build and Test
 
 on:
   push:
-    branches: [ main, develop ]
+    branches: [ master, develop ]
   pull_request:
-    branches: [ main ]
+    branches: [ master ]
 
 env:
   BUILD_TYPE: Release