feat: Implement PyPI Discovery & Monitoring Tools

Add comprehensive PyPI discovery and monitoring capabilities with 4 core tools:

- monitor_pypi_new_releases: Track new releases by category with real-time alerts
- get_pypi_trending_today: Analyze current trending packages with market insights
- search_pypi_by_maintainer: Find packages by maintainer with portfolio analysis
- get_pypi_package_recommendations: Algorithm-based package recommendations

Features:
- RSS feed integration for real-time release monitoring
- Intelligent caching system with configurable TTL
- Advanced package categorization and filtering
- Trending analysis with multiple data signals
- Personalized recommendations with user context
- Comprehensive error handling and logging
- Full test coverage with mocked dependencies
- MCP server endpoints for all discovery tools

Dependencies:
- Add feedparser for RSS feed parsing
- Enhanced server.py with 4 new MCP tool endpoints
- Updated tools/__init__.py exports

This implementation provides production-ready monitoring and discovery
capabilities that integrate seamlessly with the existing codebase architecture.

pypi_query_mcp/tools/__init__.py

@@ -41,6 +41,12 @@ from .search import (
     search_by_category,
     search_packages,
 )
+from .discovery import (
+    get_pypi_package_recommendations,
+    get_pypi_trending_today,
+    monitor_pypi_new_releases,
+    search_pypi_by_maintainer,
+)
 from .analytics import (
     analyze_pypi_competition,
     get_pypi_package_analytics,
@@ -78,4 +84,8 @@ __all__ = [
     "get_pypi_security_alerts",
     "get_pypi_package_rankings",
     "analyze_pypi_competition",
+    "monitor_pypi_new_releases",
+    "get_pypi_trending_today",
+    "search_pypi_by_maintainer",
+    "get_pypi_package_recommendations",
 ]