✨ feat(support): add pixi and pdm package manager support

[KemingHe]

Major feature expansion adding pixi and pdm package manager support alongside Python 3.13 upgrade, extending coverage from 4 to 6 Python package managers with full auto-updating documentation pipeline.

Closes #7
Closes #8

🎯 Key Features

• Pixi Integration: Complete support for prefix-dev/pixi documentation with auto-update workflow
• PDM Integration: Full pdm-project/pdm documentation integration and search capabilities
• Python 3.13 Upgrade: Modernized development and Docker environments to Python 3.13
• Enhanced MCP Tool: Extended search tool to support 6 package managers with type-safe filtering
• Documentation Overhaul: Comprehensive updates across all README files with proper package manager links

💼 Business Impact

• Market Coverage: Expands from 4 to 6 major Python package managers, covering broader ecosystem needs
• Modular Design Validation: Demonstrates ease of system upgrades through clean architecture patterns
• User Experience: Developers can now access official pixi and pdm documentation alongside existing tools
• Auto-Update Pipeline: Weekly documentation sync now includes all 6 package managers automatically
• Developer Adoption: Supports emerging package managers gaining traction in Python community

🔧 Technical Highlights

• Matrix-Driven Architecture: Added pixi/pdm with just 2 clean matrix entries, validating scalable design
• Type System Safety: Extended Literal types maintain compile-time safety for new package filters
• Performance Optimization: Doubled search index heap allocation (50MB→100MB) for larger dataset
• GitHub Actions Enhancement: Removed signoff requirements (bot compatibility) while maintaining automation
• Zero Breaking Changes: Backward-compatible API ensures seamless upgrades for existing users
• Documentation Consistency: Unified link structure and roadmap updates across all user-facing content

[Copilot]

Pull Request Overview

This PR adds support for two new Python package managers (pixi and pdm) to the existing MCP server, expanding coverage from 4 to 6 package managers. The changes also include a Python version upgrade to 3.13 and performance optimizations for the search index.

• Extends package manager support by adding pixi and pdm to existing pip, conda, poetry, and uv
• Upgrades Python version requirement from 3.12 to 3.13 across all environments
• Doubles search index heap allocation from 50MB to 100MB for improved performance

Reviewed Changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/mcp_server.py	Updates type annotations and documentation to include new package managers
src/build_index.py	Increases heap size and updates schema documentation for new packages
pyproject.toml	Bumps version to 0.1.1 and upgrades Python requirement to 3.13
README.md	Updates package manager list with proper links and marks roadmap items complete
README-dockerhub.md	Adds major update notice and updates package manager documentation
Dockerfile	Upgrades base images from Python 3.12 to 3.13
CONTRIBUTING.md	Minor formatting improvements and documentation updates
.python-version	Updates Python version from 3.12 to 3.13
.github/workflows/auto-update-index.yml	Removes signoff requirement from commit options
.github/workflows/auto-update-docs.yml	Adds pixi and pdm to documentation update matrix and removes signoff

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