feat: add MCP prompt templates for PyPI package analysis and decision-making

- Add comprehensive prompt templates for package analysis, dependency management, and migration planning
- Implement 8 prompt templates covering quality analysis, package comparison, alternatives suggestion, dependency conflicts, version upgrades, security audits, and migration planning
- Add detailed documentation in PROMPT_TEMPLATES.md with usage examples
- Include demo script and test coverage for prompt template functionality
- Update README.md to highlight new prompt template features
- Templates provide structured guidance for common PyPI package scenarios

Signed-off-by: longhao <hal.long@outlook.com>

pypi_query_mcp/prompts/__init__.py

@@ -0,0 +1,34 @@
+"""MCP prompt templates for PyPI package queries.
+
+This package contains FastMCP prompt implementations that provide
+reusable templates for common PyPI package analysis and decision-making scenarios.
+"""
+
+from .dependency_management import (
+    audit_security_risks,
+    plan_version_upgrade,
+    resolve_dependency_conflicts,
+)
+from .migration_guidance import (
+    generate_migration_checklist,
+    plan_package_migration,
+)
+from .package_analysis import (
+    analyze_package_quality,
+    compare_packages,
+    suggest_alternatives,
+)
+
+__all__ = [
+    # Package Analysis
+    "analyze_package_quality",
+    "compare_packages",
+    "suggest_alternatives",
+    # Dependency Management
+    "resolve_dependency_conflicts",
+    "plan_version_upgrade",
+    "audit_security_risks",
+    # Migration Guidance
+    "plan_package_migration",
+    "generate_migration_checklist",
+]