docs: reorganize all markdown files into docs folder

- Moved CLAUDE.md → docs/CLAUDE.md (AI-assisted edit guidelines)
- Moved CONTRIBUTING.md → docs/CONTRIBUTING.md (contribution guidelines)
- Moved INSTALL.md → docs/INSTALL.md (installation guide)
- Moved README_zh.md → docs/README_zh.md (Chinese readme)
- Updated README.md to reference files in docs/ folder

Rationale: All documentation files except README.md are now in the docs/
folder for better organization and clarity.

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jzhu

README.md

@@ -32,9 +32,9 @@ Key files and responsibilities
 
 - README.md (this file): User-facing quick-start and developer deep analysis (this section).
 
-- INSTALL.md: Detailed installation options and scripts.
+- docs/INSTALL.md: Detailed installation options and scripts.
 
-- CLAUDE.md: Repository guidelines for AI-assisted edits. Important: follow these when creating AI-generated changes.
+- docs/CLAUDE.md: Repository guidelines for AI-assisted edits. Important: follow these when creating AI-generated changes.
 
 - pytest.ini: Configures test discovery and pytest run options.
 
@@ -53,7 +53,7 @@ Development workflow and testing
 - Recommended local development flow:
   1. Create a feature branch: feature/<desc> or fix/<desc>.
   2. Run linters and formatters (project uses Black/Flake8? not enforced in repo snapshot) and the full test suite.
-  3. Make focused commits and open a PR with tests and a clear description. Include `Co-Authored-By: Claude <noreply@anthropic.com>` when AI-assisted edits were used (see CLAUDE.md).
+  3. Make focused commits and open a PR with tests and a clear description. Include `Co-Authored-By: Claude <noreply@anthropic.com>` when AI-assisted edits were used (see docs/CLAUDE.md).
 
 - Tests are fairly extensive and broken into unit, integration, and interactive categories under tests/.
 
@@ -97,7 +97,7 @@ Areas for improvement and recommendations
 
 5. Hardening: Add secrets scanning to CI and improve the heuristic used in the doctor security check (e.g., integrate detect-secrets or truffleHog).
 
-6. Documentation: Add a CONTRIBUTING.md and CODE_OF_CONDUCT.md to standardize PR process and contributor expectations (though CLAUDE.md provides AI-specific guidance).
+6. Documentation: docs/CONTRIBUTING.md and CODE_OF_CONDUCT.md to standardize PR process and contributor expectations (though docs/CLAUDE.md provides AI-specific guidance).
 
 7. Release automation: Add a release workflow for pushing to PyPI and draft GitHub releases; ensure version bumping is automated (bump2version or similar).
 

CLAUDE.md docs/CLAUDE.mdCLAUDE.md renamed to docs/CLAUDE.md

@@ -386,4 +386,4 @@ After successful installation:
 4. **Explore Features**: Try `code-assistant-manager --help` to see all options
 
 For detailed configuration instructions, see the main [README.md](README.md) file.</content>
-<parameter name="file_path">INSTALL.md
+<parameter name="file_path">INSTALL.md