📦 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/full/symbol/async-dispose.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/async-dispose');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/async-iterator.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/async-iterator');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/custom-matcher.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/esnext.symbol.custom-matcher');
+var WrappedWellKnownSymbolModule = require('../../internals/well-known-symbol-wrapped');
+
+module.exports = WrappedWellKnownSymbolModule.f('customMatcher');

frontend/node_modules/core-js-pure/full/symbol/description.js

@@ -0,0 +1,2 @@
+'use strict';
+require('../../modules/es.symbol.description');

frontend/node_modules/core-js-pure/full/symbol/dispose.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/dispose');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/for.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/for');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/has-instance.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/has-instance');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/index.js

@@ -0,0 +1,15 @@
+'use strict';
+var parent = require('../../actual/symbol');
+require('../../modules/esnext.symbol.is-registered-symbol');
+require('../../modules/esnext.symbol.is-well-known-symbol');
+require('../../modules/esnext.symbol.custom-matcher');
+require('../../modules/esnext.symbol.observable');
+// TODO: Remove from `core-js@4`
+require('../../modules/esnext.symbol.is-registered');
+require('../../modules/esnext.symbol.is-well-known');
+require('../../modules/esnext.symbol.matcher');
+require('../../modules/esnext.symbol.metadata-key');
+require('../../modules/esnext.symbol.pattern-match');
+require('../../modules/esnext.symbol.replace-all');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/is-concat-spreadable.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/is-concat-spreadable');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/is-registered-symbol.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/es.symbol');
+require('../../modules/esnext.symbol.is-registered-symbol');
+var path = require('../../internals/path');
+
+module.exports = path.Symbol.isRegisteredSymbol;

frontend/node_modules/core-js-pure/full/symbol/is-registered.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/es.symbol');
+require('../../modules/esnext.symbol.is-registered');
+var path = require('../../internals/path');
+
+module.exports = path.Symbol.isRegistered;

frontend/node_modules/core-js-pure/full/symbol/is-well-known-symbol.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/es.symbol');
+require('../../modules/esnext.symbol.is-well-known-symbol');
+var path = require('../../internals/path');
+
+module.exports = path.Symbol.isWellKnownSymbol;

frontend/node_modules/core-js-pure/full/symbol/is-well-known.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/es.symbol');
+require('../../modules/esnext.symbol.is-well-known');
+var path = require('../../internals/path');
+
+module.exports = path.Symbol.isWellKnown;

frontend/node_modules/core-js-pure/full/symbol/iterator.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/iterator');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/key-for.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/key-for');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/match-all.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/match-all');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/match.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/match');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/matcher.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/esnext.symbol.matcher');
+var WrappedWellKnownSymbolModule = require('../../internals/well-known-symbol-wrapped');
+
+module.exports = WrappedWellKnownSymbolModule.f('matcher');

frontend/node_modules/core-js-pure/full/symbol/metadata-key.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/esnext.symbol.metadata-key');
+var WrappedWellKnownSymbolModule = require('../../internals/well-known-symbol-wrapped');
+
+module.exports = WrappedWellKnownSymbolModule.f('metadataKey');

frontend/node_modules/core-js-pure/full/symbol/metadata.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/metadata');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/observable.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/esnext.symbol.observable');
+var WrappedWellKnownSymbolModule = require('../../internals/well-known-symbol-wrapped');
+
+module.exports = WrappedWellKnownSymbolModule.f('observable');

frontend/node_modules/core-js-pure/full/symbol/pattern-match.js

@@ -0,0 +1,6 @@
+'use strict';
+// TODO: Remove from `core-js@4`
+require('../../modules/esnext.symbol.pattern-match');
+var WrappedWellKnownSymbolModule = require('../../internals/well-known-symbol-wrapped');
+
+module.exports = WrappedWellKnownSymbolModule.f('patternMatch');

frontend/node_modules/core-js-pure/full/symbol/replace-all.js

@@ -0,0 +1,6 @@
+'use strict';
+// TODO: Remove from `core-js@4`
+require('../../modules/esnext.symbol.replace-all');
+var WrappedWellKnownSymbolModule = require('../../internals/well-known-symbol-wrapped');
+
+module.exports = WrappedWellKnownSymbolModule.f('replaceAll');

frontend/node_modules/core-js-pure/full/symbol/replace.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/replace');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/search.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/search');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/species.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/species');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/split.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/split');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/to-primitive.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/to-primitive');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/to-string-tag.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/to-string-tag');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/symbol/unscopables.js

@@ -0,0 +1,4 @@
+'use strict';
+var parent = require('../../actual/symbol/unscopables');
+
+module.exports = parent;