📦 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/eslint-plugin-jsx-a11y/docs/rules/role-supports-aria-props.md

@@ -0,0 +1,39 @@
+# jsx-a11y/role-supports-aria-props
+
+💼 This rule is enabled in the following configs: ☑️ `recommended`, 🔒 `strict`.
+
+<!-- end auto-generated rule header -->
+
+Enforce that elements with explicit or implicit roles defined contain only `aria-*` properties supported by that `role`. Many ARIA attributes (states and properties) can only be used on elements with particular roles. Some elements have implicit roles, such as `<a href="#" />`, which will resolve to `role="link"`.
+
+## Rule details
+
+This rule takes no arguments.
+
+### Succeed
+```jsx
+<!-- Good: the radiogroup role does support the aria-required property -->
+<ul role="radiogroup" aria-required aria-labelledby="foo">
+    <li tabIndex="-1" role="radio" aria-checked="false">Rainbow Trout</li>
+    <li tabIndex="-1" role="radio" aria-checked="false">Brook Trout</li>
+    <li tabIndex="0" role="radio" aria-checked="true">Lake Trout</li>
+</ul>
+```
+
+### Fail
+
+```jsx
+<!-- Bad: the radio role does not support the aria-required property -->
+<ul role="radiogroup" aria-labelledby="foo">
+    <li aria-required tabIndex="-1" role="radio" aria-checked="false">Rainbow Trout</li>
+    <li aria-required tabIndex="-1" role="radio" aria-checked="false">Brook Trout</li>
+    <li aria-required tabIndex="0" role="radio" aria-checked="true">Lake Trout</li>
+</ul>
+```
+
+## Accessibility guidelines
+- [WCAG 4.1.2](https://www.w3.org/WAI/WCAG21/Understanding/name-role-value)
+
+### Resources
+- [ARIA Spec, States and Properties](https://www.w3.org/TR/wai-aria/#states_and_properties)
+- [Chrome Audit Rules, AX_ARIA_10](https://github.com/GoogleChrome/accessibility-developer-tools/wiki/Audit-Rules#ax_aria_10)