- Introduced `r2d2` connection pooling for SQLite in `database.rs`.
- Updated `Indexer` to use pooled connections for improved concurrency.
- Replaced sequential processing with `rayon` for parallel file scanning.
- Added a `clear` method to `Indexer` for reindexing support.
- Enhanced database initialization with `init` and `from_pool` methods.
- Updated `Cargo.toml` and `Cargo.lock` to include `r2d2`, `r2d2_sqlite`, and new dependencies.
- Introduced `issues` table for detailed vulnerability storage.
- Enhanced `files` table with project scoping and unique constraints.
- Replaced `OutputFormat` enum with `String` for flexibility.
- Added support for formatted console output of scan results.
- Integrated file and issue updating logic for incremental scans.
- Optimized scanning by leveraging database-stored issues.
