chore: Bump version to v2.5.0 - Multi-Platform Feature Parity

Prepare v2.5.0 release with multi-LLM platform support.

Major changes:
- Add support for 4 platforms (Claude, Gemini, OpenAI, Markdown)
- Complete feature parity across all platforms
- 18 MCP tools with multi-platform support
- Comprehensive platform documentation

Updated files:
- pyproject.toml: version 2.4.0 → 2.5.0
- README.md: version badge updated, tests 427 → 700
- CHANGELOG.md: Added v2.5.0 release notes
- docs/CLAUDE.md: Updated version and features

Release date: 2025-12-28

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "skill-seekers"
-version = "2.4.0"
+version = "2.5.0"
 description = "Convert documentation websites, GitHub repositories, and PDFs into Claude AI skills"
 readme = "README.md"
 requires-python = ">=3.10"