📦 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/@babel/plugin-transform-literals/lib/index.js

@@ -0,0 +1,31 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _helperPluginUtils = require("@babel/helper-plugin-utils");
+var _default = exports.default = (0, _helperPluginUtils.declare)(api => {
+  api.assertVersion(7);
+  return {
+    name: "transform-literals",
+    visitor: {
+      NumericLiteral({
+        node
+      }) {
+        if (node.extra && /^0[ob]/i.test(node.extra.raw)) {
+          node.extra = undefined;
+        }
+      },
+      StringLiteral({
+        node
+      }) {
+        if (node.extra && /\\u/i.test(node.extra.raw)) {
+          node.extra = undefined;
+        }
+      }
+    }
+  };
+});
+
+//# sourceMappingURL=index.js.map

frontend/node_modules/@babel/plugin-transform-literals/lib/index.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["_helperPluginUtils","require","_default","exports","default","declare","api","assertVersion","name","visitor","NumericLiteral","node","extra","test","raw","undefined","StringLiteral"],"sources":["../src/index.ts"],"sourcesContent":["import { declare } from \"@babel/helper-plugin-utils\";\n\nexport default declare(api => {\n  api.assertVersion(REQUIRED_VERSION(7));\n\n  return {\n    name: \"transform-literals\",\n\n    visitor: {\n      NumericLiteral({ node }) {\n        // number octal like 0b10 or 0o70\n        // @ts-expect-error Add node.extra typings\n        if (node.extra && /^0[ob]/i.test(node.extra.raw)) {\n          node.extra = undefined;\n        }\n      },\n\n      StringLiteral({ node }) {\n        // unicode escape\n        // @ts-expect-error Add node.extra typings\n        if (node.extra && /\\\\u/i.test(node.extra.raw)) {\n          node.extra = undefined;\n        }\n      },\n    },\n  };\n});\n"],"mappings":";;;;;;AAAA,IAAAA,kBAAA,GAAAC,OAAA;AAAqD,IAAAC,QAAA,GAAAC,OAAA,CAAAC,OAAA,GAEtC,IAAAC,0BAAO,EAACC,GAAG,IAAI;EAC5BA,GAAG,CAACC,aAAa,CAAkB,CAAE,CAAC;EAEtC,OAAO;IACLC,IAAI,EAAE,oBAAoB;IAE1BC,OAAO,EAAE;MACPC,cAAcA,CAAC;QAAEC;MAAK,CAAC,EAAE;QAGvB,IAAIA,IAAI,CAACC,KAAK,IAAI,SAAS,CAACC,IAAI,CAACF,IAAI,CAACC,KAAK,CAACE,GAAG,CAAC,EAAE;UAChDH,IAAI,CAACC,KAAK,GAAGG,SAAS;QACxB;MACF,CAAC;MAEDC,aAAaA,CAAC;QAAEL;MAAK,CAAC,EAAE;QAGtB,IAAIA,IAAI,CAACC,KAAK,IAAI,MAAM,CAACC,IAAI,CAACF,IAAI,CAACC,KAAK,CAACE,GAAG,CAAC,EAAE;UAC7CH,IAAI,CAACC,KAAK,GAAGG,SAAS;QACxB;MACF;IACF;EACF,CAAC;AACH,CAAC,CAAC","ignoreList":[]}