📦 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/features/instance/at.js

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+'use strict';
+module.exports = require('../../full/instance/at');

frontend/node_modules/core-js/features/instance/bind.js

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+'use strict';
+module.exports = require('../../full/instance/bind');

frontend/node_modules/core-js/features/instance/clamp.js

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+'use strict';
+module.exports = require('../../full/instance/clamp');

frontend/node_modules/core-js/features/instance/code-point-at.js

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+'use strict';
+module.exports = require('../../full/instance/code-point-at');

frontend/node_modules/core-js/features/instance/code-points.js

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+'use strict';
+module.exports = require('../../full/instance/code-points');

frontend/node_modules/core-js/features/instance/concat.js

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+'use strict';
+module.exports = require('../../full/instance/concat');

frontend/node_modules/core-js/features/instance/copy-within.js

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+'use strict';
+module.exports = require('../../full/instance/copy-within');

frontend/node_modules/core-js/features/instance/demethodize.js

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+'use strict';
+module.exports = require('../../full/instance/demethodize');

frontend/node_modules/core-js/features/instance/ends-with.js

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+'use strict';
+module.exports = require('../../full/instance/ends-with');

frontend/node_modules/core-js/features/instance/entries.js

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+'use strict';
+module.exports = require('../../full/instance/entries');

frontend/node_modules/core-js/features/instance/every.js

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+'use strict';
+module.exports = require('../../full/instance/every');

frontend/node_modules/core-js/features/instance/fill.js

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+'use strict';
+module.exports = require('../../full/instance/fill');

frontend/node_modules/core-js/features/instance/filter-out.js

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+'use strict';
+module.exports = require('../../full/instance/filter-out');

frontend/node_modules/core-js/features/instance/filter-reject.js

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+'use strict';
+module.exports = require('../../full/instance/filter-reject');

frontend/node_modules/core-js/features/instance/filter.js

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+'use strict';
+module.exports = require('../../full/instance/filter');

frontend/node_modules/core-js/features/instance/find-index.js

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+'use strict';
+module.exports = require('../../full/instance/find-index');

frontend/node_modules/core-js/features/instance/find-last-index.js

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+'use strict';
+module.exports = require('../../full/instance/find-last-index');

frontend/node_modules/core-js/features/instance/find-last.js

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+'use strict';
+module.exports = require('../../full/instance/find-last');

frontend/node_modules/core-js/features/instance/find.js

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+'use strict';
+module.exports = require('../../full/instance/find');

frontend/node_modules/core-js/features/instance/flags.js

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+'use strict';
+module.exports = require('../../full/instance/flags');

frontend/node_modules/core-js/features/instance/flat-map.js

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+'use strict';
+module.exports = require('../../full/instance/flat-map');

frontend/node_modules/core-js/features/instance/flat.js

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+'use strict';
+module.exports = require('../../full/instance/flat');

frontend/node_modules/core-js/features/instance/for-each.js

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+'use strict';
+module.exports = require('../../full/instance/for-each');

frontend/node_modules/core-js/features/instance/group-by-to-map.js

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+'use strict';
+module.exports = require('../../full/instance/group-by-to-map');

frontend/node_modules/core-js/features/instance/group-by.js

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+'use strict';
+module.exports = require('../../full/instance/group-by');

frontend/node_modules/core-js/features/instance/group-to-map.js

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+'use strict';
+module.exports = require('../../full/instance/group-to-map');

frontend/node_modules/core-js/features/instance/group.js

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+'use strict';
+module.exports = require('../../full/instance/group');

frontend/node_modules/core-js/features/instance/includes.js

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+'use strict';
+module.exports = require('../../full/instance/includes');

frontend/node_modules/core-js/features/instance/index-of.js

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+'use strict';
+module.exports = require('../../full/instance/index-of');

frontend/node_modules/core-js/features/instance/is-well-formed.js

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+'use strict';
+module.exports = require('../../full/instance/is-well-formed');

frontend/node_modules/core-js/features/instance/keys.js

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+'use strict';
+module.exports = require('../../full/instance/keys');

frontend/node_modules/core-js/features/instance/last-index-of.js

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+'use strict';
+module.exports = require('../../full/instance/last-index-of');

frontend/node_modules/core-js/features/instance/map.js

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+'use strict';
+module.exports = require('../../full/instance/map');

frontend/node_modules/core-js/features/instance/match-all.js

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+'use strict';
+module.exports = require('../../full/instance/match-all');

frontend/node_modules/core-js/features/instance/pad-end.js

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+'use strict';
+module.exports = require('../../full/instance/pad-end');

frontend/node_modules/core-js/features/instance/pad-start.js

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+'use strict';
+module.exports = require('../../full/instance/pad-start');

frontend/node_modules/core-js/features/instance/push.js

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+'use strict';
+module.exports = require('../../full/instance/push');

frontend/node_modules/core-js/features/instance/reduce-right.js

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+'use strict';
+module.exports = require('../../full/instance/reduce-right');

frontend/node_modules/core-js/features/instance/reduce.js

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+'use strict';
+module.exports = require('../../full/instance/reduce');

frontend/node_modules/core-js/features/instance/repeat.js

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+'use strict';
+module.exports = require('../../full/instance/repeat');

frontend/node_modules/core-js/features/instance/replace-all.js

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+'use strict';
+module.exports = require('../../full/instance/replace-all');

frontend/node_modules/core-js/features/instance/reverse.js

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+'use strict';
+module.exports = require('../../full/instance/reverse');

frontend/node_modules/core-js/features/instance/slice.js

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+'use strict';
+module.exports = require('../../full/instance/slice');

frontend/node_modules/core-js/features/instance/some.js

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+'use strict';
+module.exports = require('../../full/instance/some');

frontend/node_modules/core-js/features/instance/sort.js

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+'use strict';
+module.exports = require('../../full/instance/sort');

frontend/node_modules/core-js/features/instance/splice.js

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+'use strict';
+module.exports = require('../../full/instance/splice');

frontend/node_modules/core-js/features/instance/starts-with.js

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+'use strict';
+module.exports = require('../../full/instance/starts-with');

frontend/node_modules/core-js/features/instance/to-reversed.js

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+'use strict';
+module.exports = require('../../full/instance/to-reversed');

frontend/node_modules/core-js/features/instance/to-sorted.js

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+'use strict';
+module.exports = require('../../full/instance/to-sorted');

frontend/node_modules/core-js/features/instance/to-spliced.js

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+'use strict';
+module.exports = require('../../full/instance/to-spliced');

frontend/node_modules/core-js/features/instance/to-well-formed.js

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+'use strict';
+module.exports = require('../../full/instance/to-well-formed');

frontend/node_modules/core-js/features/instance/trim-end.js

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+'use strict';
+module.exports = require('../../full/instance/trim-end');

frontend/node_modules/core-js/features/instance/trim-left.js

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+'use strict';
+module.exports = require('../../full/instance/trim-left');

frontend/node_modules/core-js/features/instance/trim-right.js

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+'use strict';
+module.exports = require('../../full/instance/trim-right');

frontend/node_modules/core-js/features/instance/trim-start.js

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+'use strict';
+module.exports = require('../../full/instance/trim-start');

frontend/node_modules/core-js/features/instance/trim.js

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+'use strict';
+module.exports = require('../../full/instance/trim');

frontend/node_modules/core-js/features/instance/un-this.js

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+'use strict';
+module.exports = require('../../full/instance/un-this');

frontend/node_modules/core-js/features/instance/unique-by.js

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+'use strict';
+module.exports = require('../../full/instance/unique-by');

frontend/node_modules/core-js/features/instance/unshift.js

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+'use strict';
+module.exports = require('../../full/instance/unshift');

frontend/node_modules/core-js/features/instance/values.js

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+'use strict';
+module.exports = require('../../full/instance/values');

frontend/node_modules/core-js/features/instance/with.js

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+'use strict';
+module.exports = require('../../full/instance/with');