feat: 添加信息图生成功能及其多语言提示，并更新相关逻辑。

plugins/actions/infographic/prompts/user_prompt_en.md

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+# 📝 Smart Infographic User Prompt (English)
+
+The following is a preset user prompt template. You can save it as an OpenWebUI **Prompt** template for quick access.
+
+**Title**: Generate Infographic
+**Command**: `/infographic-en`
+**Content**:
+
+```markdown
+Please analyze the following text content and convert its core information into AntV Infographic syntax format.
+
+**Text Content:**
+{{content}}
+
+**Requirements:**
+1.  Choose the most appropriate infographic template based on the content (e.g., list, flowchart, comparison, chart, etc.).
+2.  Output a valid `infographic` syntax code block.
+3.  If using `list-grid` format, ensure card descriptions are concise (around 60 characters).
+4.  Use two-space indentation and do NOT use colons for key-value pairs.
+```
+
+## 💡 Usage Tips
+
+1.  **Create Prompt**: Go to OpenWebUI **Workspace** -> **Prompts** -> **Create Prompt**.
+2.  **Variables**: `{{content}}` is a placeholder. When using it, you can input text directly or let the model auto-fill based on context.
+3.  **Invocation**: Type `/` in the chat input box to see your command (e.g., `/infographic-en`), select it, and enter the text you want to convert.