📦 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/full/math/acosh.js

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+'use strict';
+var parent = require('../../actual/math/acosh');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/asinh.js

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+'use strict';
+var parent = require('../../actual/math/asinh');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/atanh.js

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+'use strict';
+var parent = require('../../actual/math/atanh');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/cbrt.js

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+'use strict';
+var parent = require('../../actual/math/cbrt');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/clamp.js

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+'use strict';
+// TODO: Remove from `core-js@4`
+require('../../modules/esnext.math.clamp');
+var path = require('../../internals/path');
+
+module.exports = path.Math.clamp;

frontend/node_modules/core-js/full/math/clz32.js

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+'use strict';
+var parent = require('../../actual/math/clz32');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/cosh.js

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+'use strict';
+var parent = require('../../actual/math/cosh');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/deg-per-rad.js

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+'use strict';
+require('../../modules/esnext.math.deg-per-rad');
+
+module.exports = Math.PI / 180;

frontend/node_modules/core-js/full/math/degrees.js

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+'use strict';
+require('../../modules/esnext.math.degrees');
+var path = require('../../internals/path');
+
+module.exports = path.Math.degrees;

frontend/node_modules/core-js/full/math/expm1.js

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+'use strict';
+var parent = require('../../actual/math/expm1');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/f16round.js

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+'use strict';
+var parent = require('../../actual/math/f16round');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/fround.js

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+'use strict';
+var parent = require('../../actual/math/fround');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/fscale.js

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+'use strict';
+require('../../modules/esnext.math.fscale');
+var path = require('../../internals/path');
+
+module.exports = path.Math.fscale;

frontend/node_modules/core-js/full/math/hypot.js

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+'use strict';
+var parent = require('../../actual/math/hypot');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/iaddh.js

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+'use strict';
+require('../../modules/esnext.math.iaddh');
+var path = require('../../internals/path');
+
+module.exports = path.Math.iaddh;

frontend/node_modules/core-js/full/math/imul.js

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+'use strict';
+var parent = require('../../actual/math/imul');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/imulh.js

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+'use strict';
+require('../../modules/esnext.math.imulh');
+var path = require('../../internals/path');
+
+module.exports = path.Math.imulh;

frontend/node_modules/core-js/full/math/index.js

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+'use strict';
+var parent = require('../../actual/math');
+// TODO: Remove from `core-js@4`
+require('../../modules/esnext.math.clamp');
+require('../../modules/esnext.math.deg-per-rad');
+require('../../modules/esnext.math.degrees');
+require('../../modules/esnext.math.fscale');
+require('../../modules/esnext.math.rad-per-deg');
+require('../../modules/esnext.math.radians');
+require('../../modules/esnext.math.scale');
+require('../../modules/esnext.math.seeded-prng');
+require('../../modules/esnext.math.signbit');
+// TODO: Remove from `core-js@4`
+require('../../modules/esnext.math.iaddh');
+require('../../modules/esnext.math.isubh');
+require('../../modules/esnext.math.imulh');
+require('../../modules/esnext.math.umulh');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/isubh.js

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+'use strict';
+require('../../modules/esnext.math.isubh');
+var path = require('../../internals/path');
+
+module.exports = path.Math.isubh;

frontend/node_modules/core-js/full/math/log10.js

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+'use strict';
+var parent = require('../../actual/math/log10');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/log1p.js

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+'use strict';
+var parent = require('../../actual/math/log1p');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/log2.js

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+'use strict';
+var parent = require('../../actual/math/log2');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/rad-per-deg.js

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+'use strict';
+require('../../modules/esnext.math.rad-per-deg');
+
+module.exports = 180 / Math.PI;

frontend/node_modules/core-js/full/math/radians.js

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+'use strict';
+require('../../modules/esnext.math.radians');
+var path = require('../../internals/path');
+
+module.exports = path.Math.radians;

frontend/node_modules/core-js/full/math/scale.js

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+'use strict';
+require('../../modules/esnext.math.scale');
+var path = require('../../internals/path');
+
+module.exports = path.Math.scale;

frontend/node_modules/core-js/full/math/seeded-prng.js

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+'use strict';
+require('../../modules/esnext.math.seeded-prng');
+var path = require('../../internals/path');
+
+module.exports = path.Math.seededPRNG;

frontend/node_modules/core-js/full/math/sign.js

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+'use strict';
+var parent = require('../../actual/math/sign');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/signbit.js

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+'use strict';
+require('../../modules/esnext.math.signbit');
+var path = require('../../internals/path');
+
+module.exports = path.Math.signbit;

frontend/node_modules/core-js/full/math/sinh.js

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+'use strict';
+var parent = require('../../actual/math/sinh');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/sum-precise.js

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+'use strict';
+var parent = require('../../actual/math/sum-precise');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/tanh.js

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+'use strict';
+var parent = require('../../actual/math/tanh');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/to-string-tag.js

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+'use strict';
+var parent = require('../../actual/math/to-string-tag');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/trunc.js

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+'use strict';
+var parent = require('../../actual/math/trunc');
+
+module.exports = parent;

frontend/node_modules/core-js/full/math/umulh.js

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+'use strict';
+require('../../modules/esnext.math.umulh');
+var path = require('../../internals/path');
+
+module.exports = path.Math.umulh;