📦 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/core-js-pure/stable/object/assign.js

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+'use strict';
+var parent = require('../../es/object/assign');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/create.js

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+'use strict';
+var parent = require('../../es/object/create');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/define-getter.js

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+'use strict';
+var parent = require('../../es/object/define-getter');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/define-properties.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../es/object/define-properties');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/define-property.js

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+'use strict';
+var parent = require('../../es/object/define-property');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/define-setter.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../es/object/define-setter');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/entries.js

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+'use strict';
+var parent = require('../../es/object/entries');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/freeze.js

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+'use strict';
+var parent = require('../../es/object/freeze');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/from-entries.js

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+'use strict';
+var parent = require('../../es/object/from-entries');
+require('../../modules/web.dom-collections.iterator');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/get-own-property-descriptor.js

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+'use strict';
+var parent = require('../../es/object/get-own-property-descriptor');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/get-own-property-descriptors.js

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+'use strict';
+var parent = require('../../es/object/get-own-property-descriptors');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/get-own-property-names.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../es/object/get-own-property-names');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/get-own-property-symbols.js

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+'use strict';
+var parent = require('../../es/object/get-own-property-symbols');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/get-prototype-of.js

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+'use strict';
+var parent = require('../../es/object/get-prototype-of');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/group-by.js

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+'use strict';
+var parent = require('../../es/object/group-by');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/has-own.js

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+'use strict';
+var parent = require('../../es/object/has-own');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/index.js

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+'use strict';
+var parent = require('../../es/object');
+require('../../modules/web.dom-collections.iterator');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/is-extensible.js

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+'use strict';
+var parent = require('../../es/object/is-extensible');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/is-frozen.js

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+'use strict';
+var parent = require('../../es/object/is-frozen');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/is-sealed.js

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+'use strict';
+var parent = require('../../es/object/is-sealed');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/is.js

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+'use strict';
+var parent = require('../../es/object/is');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/keys.js

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+'use strict';
+var parent = require('../../es/object/keys');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/lookup-getter.js

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+'use strict';
+var parent = require('../../es/object/lookup-getter');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/lookup-setter.js

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+'use strict';
+var parent = require('../../es/object/lookup-setter');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/prevent-extensions.js

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+'use strict';
+var parent = require('../../es/object/prevent-extensions');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/proto.js

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+'use strict';
+var parent = require('../../es/object/proto');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/seal.js

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+'use strict';
+var parent = require('../../es/object/seal');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/set-prototype-of.js

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+'use strict';
+var parent = require('../../es/object/set-prototype-of');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/to-string.js

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+'use strict';
+var parent = require('../../es/object/to-string');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/stable/object/values.js

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+'use strict';
+var parent = require('../../es/object/values');
+
+module.exports = parent;