feat: 新增插件系统、多种插件类型、开发指南及多语言文档。

plugins/actions/knowledge-card/README.md

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+# Flash Card
+
+Quickly generates beautiful flashcards from text, extracting key points and categories for efficient learning.
+
+## Features
+
+- **Instant Generation**: Turn any text into a structured flashcard.
+- **Key Point Extraction**: Automatically identifies core concepts.
+- **Visual Design**: Generates a visually appealing HTML card.
+
+## Usage
+
+1. Install the plugin.
+2. Send text to the chat.
+3. The plugin will analyze the text and generate a flashcard.