fix: Sync version numbers across all __init__.py files to 2.7.0

Fixed version mismatch bug where hardcoded versions were out of sync
with pyproject.toml.

Updated version from 2.5.2 to 2.7.0 in:
- src/skill_seekers/__init__.py
- src/skill_seekers/cli/__init__.py
- src/skill_seekers/mcp/__init__.py
- src/skill_seekers/mcp/tools/__init__.py

Now skill-seekers --version correctly reports: 2.7.0

Fixes #248

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/skill_seekers/cli/__init__.py

@@ -28,7 +28,7 @@ except ImportError:
     open_folder = None
     read_reference_files = None
 
-__version__ = "2.5.2"
+__version__ = "2.7.0"
 
 __all__ = [
     "LlmsTxtDetector",