feat(C2.8): Add scrape_codebase MCP tool for local codebase analysis

- Add scrape_codebase_tool() to scraping_tools.py (67 lines)
- Register tool in MCP server with @safe_tool_decorator
- Add tool to FastMCP server imports and exports
- Add 2 comprehensive tests for basic and advanced usage
- Update MCP server tool count from 17 to 18 tools
- Tool supports directory analysis with configurable depth
- Features: language filtering, file patterns, API reference generation

Closes #70 - C2.8 MCP Tool Integration complete

Related:
- Builds on C2.7 (codebase_scraper.py CLI tool)
- Uses existing code_analyzer.py infrastructure
- Follows same pattern as scrape_github and scrape_pdf tools

Test coverage:
- test_scrape_codebase_basic: Basic codebase analysis
- test_scrape_codebase_with_options: Advanced options testing

src/skill_seekers/mcp/tools/__init__.py

@@ -24,6 +24,7 @@ from .scraping_tools import (
     scrape_docs_tool as scrape_docs_impl,
     scrape_github_tool as scrape_github_impl,
     scrape_pdf_tool as scrape_pdf_impl,
+    scrape_codebase_tool as scrape_codebase_impl,
 )
 
 from .packaging_tools import (
@@ -56,6 +57,7 @@ __all__ = [
     "scrape_docs_impl",
     "scrape_github_impl",
     "scrape_pdf_impl",
+    "scrape_codebase_impl",
     # Packaging tools
     "package_skill_impl",
     "upload_skill_impl",