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#151: Add adapter-specific CLI flags support

Added addCustomOptions and extendFlags callbacks to CLIOptions for database-specific command-line flags.

Changes:
- addCustomOptions(program): Register custom flags during CLI setup
- extendFlags(config, flags): Map flag values to config at execution
- Custom flags have highest priority in config waterfall
- CLIFlags interface: Added index signature for dynamic flags

Benefits:
- Single-command execution without environment variables
- Perfect for CI/CD pipelines
- Fully backward compatible (callbacks optional)

Example:
- Firebase: --database-url, --credentials
- MongoDB: --mongo-uri, --auth-source

Documentation: 120+ lines with examples in cli-adapter-development.md

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