📦 添加虚拟环境和启动脚本

新增:
- backend/venv/ - Python 虚拟环境
- backend/start.sh - 启动脚本（使用虚拟环境）
- backend/requirements.txt - 依赖列表
- .gitignore - 忽略虚拟环境和缓存文件

说明:
- 每个项目使用独立虚拟环境
- 避免依赖冲突
- 启动脚本自动创建和激活虚拟环境

frontend/node_modules/renderkid/lib/renderKid/styleApplier/inline.js

@@ -0,0 +1,31 @@
+"use strict";
+
+// Generated by CoffeeScript 2.5.1
+var _common, inlineStyleApplier, self, tools;
+
+tools = require('../../tools');
+_common = require('./_common');
+module.exports = inlineStyleApplier = self = {
+  applyTo: function applyTo(el, style) {
+    var ret;
+    ret = _common.getStyleTagsFor(style);
+
+    if (style.marginLeft != null) {
+      ret.before = tools.repeatString("&sp;", parseInt(style.marginLeft)) + ret.before;
+    }
+
+    if (style.marginRight != null) {
+      ret.after += tools.repeatString("&sp;", parseInt(style.marginRight));
+    }
+
+    if (style.paddingLeft != null) {
+      ret.before += tools.repeatString("&sp;", parseInt(style.paddingLeft));
+    }
+
+    if (style.paddingRight != null) {
+      ret.after = tools.repeatString("&sp;", parseInt(style.paddingRight)) + ret.after;
+    }
+
+    return ret;
+  }
+};