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feat: update `report_publish_result` to use server time for `publishedAt` in v0.5.3

feat: add windowMinutes parameter to get_pending_posts for time window filtering

docs: 更新 ai-tools 安全约束文档，与实际 MCP 工具功能保持一致

chore: bump version to 0.5.0

feat: 在侧边栏 logo 下方添加版本号显示