feat: add --verbose option for detailed search progress logging

[sonesuke]

Summary

• Add --verbose flag to search and fetch commands
• Provides detailed logging of search process (URLs, pagination, results count)
• Update CI to test verbose mode functionality

Changes

• CLI (src/cli/mod.rs): Add --verbose flag to SearchArgs and FetchArgs
• Core (src/core/patent_search.rs): Implement verbose logging in search process
• MCP (src/mcp/mod.rs): Update PatentSearcher::new call to include verbose parameter
• CI (.github/workflows/ci.yml): Add verbose mode test step

Verbose Output Examples

When using --verbose, the CLI will output:

• Search URL being accessed
• Page loading status
• Pagination progress (page X of Y)
• Results count per page
• Total patents collected
• Truncation status when limit is reached

# Usage
google-patent-cli search --query "machine learning" --verbose
google-patent-cli fetch US1234567 --verbose

Test plan

• Pre-commit checks pass (fmt, clippy, test)
• Manual testing with --verbose flag
• CI will test verbose mode

🤖 Generated with Claude Code