Add IMAP protocol support and modularize email providers #2
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Refactors the application to support both JMAP and IMAP protocols via a new protocol abstraction layer. Adds IMAP provider implementation, mock/test clients, and updates configuration to allow protocol selection. Updates documentation, configuration examples, and tests to reflect multi-protocol support. Removes legacy JMAP-only code and migrates to a provider-based architecture for extensibility and maintainability.