dsh-ticktick: Bidirectional TickTick/Dida365 Task Sync Plugin for DeepSeek Harness

dsh-ticktick is an official plugin for DeepSeek Harness (DSH) that enables agents to synchronize tasks bidirectionally with TickTick. Based on the OAuth 2.0 authorization code flow, it supports fetching, creating, updating, and deduplicating tasks during synchronization, and provides a web dashboard for managing credentials. The plugin uses local encrypted storage to ensure security and is compatible with both the domestic and international versions. Users can install and configure it via commands, and after authorization, allow agents to manage TickTick tasks using natural language.