📦 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/function/bind.js

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

frontend/node_modules/core-js-pure/full/function/demethodize.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/esnext.function.demethodize');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('Function', 'demethodize');

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

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

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

@@ -0,0 +1,9 @@
+'use strict';
+var parent = require('../../actual/function');
+require('../../modules/esnext.function.demethodize');
+require('../../modules/esnext.function.is-callable');
+require('../../modules/esnext.function.is-constructor');
+// TODO: Remove from `core-js@4`
+require('../../modules/esnext.function.un-this');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/function/is-callable.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/esnext.function.is-callable');
+var path = require('../../internals/path');
+
+module.exports = path.Function.isCallable;

frontend/node_modules/core-js-pure/full/function/is-constructor.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/esnext.function.is-constructor');
+var path = require('../../internals/path');
+
+module.exports = path.Function.isConstructor;

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

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

frontend/node_modules/core-js-pure/full/function/name.js

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

frontend/node_modules/core-js-pure/full/function/un-this.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/esnext.function.un-this');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('Function', 'unThis');

frontend/node_modules/core-js-pure/full/function/virtual/bind.js

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

frontend/node_modules/core-js-pure/full/function/virtual/demethodize.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../../modules/esnext.function.demethodize');
+var getBuiltInPrototypeMethod = require('../../../internals/get-built-in-prototype-method');
+
+module.exports = getBuiltInPrototypeMethod('Function', 'demethodize');

frontend/node_modules/core-js-pure/full/function/virtual/index.js

@@ -0,0 +1,7 @@
+'use strict';
+var parent = require('../../../actual/function/virtual');
+require('../../../modules/esnext.function.demethodize');
+// TODO: Remove from `core-js@4`
+require('../../../modules/esnext.function.un-this');
+
+module.exports = parent;

frontend/node_modules/core-js-pure/full/function/virtual/un-this.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../../modules/esnext.function.un-this');
+var getBuiltInPrototypeMethod = require('../../../internals/get-built-in-prototype-method');
+
+module.exports = getBuiltInPrototypeMethod('Function', 'unThis');