docs: Update repository name from wikijs-sdk-python to py-wikijs

Updated all repository URL references to reflect the new repository name:
- setup.py: Updated project URLs
- pyproject.toml: Updated project URLs
- README.md: Updated badges and installation commands
- CLAUDE.md: Updated deployment strategy
- docs/wikijs_sdk_release_plan.md: Updated repository URL
- docs/CONTRIBUTING.md: Updated clone URLs and issue tracker links

Note: Python package name remains 'wikijs-python-sdk' for consistency
with pip naming conventions. Only repository name changed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

CLAUDE.md

@@ -760,7 +760,7 @@ This document evolves based on development experience:
 **DEPLOYMENT STRATEGY**:
 - Maintain backward compatibility with v0.1.0
 - Gitea-only deployment continues
-- Users install via: `pip install git+https://gitea.hotserv.cloud/lmiranda/wikijs-sdk-python.git@v0.2.0`
+- Users install via: `pip install git+https://gitea.hotserv.cloud/lmiranda/py-wikijs.git@v0.2.0`
 
 **DEVELOPMENT PRINCIPLES**:
 1. ✅ **Test-Driven Development**: Write tests first, then implementation