📦 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/webpack/lib/WebpackIsIncludedPlugin.js

@@ -0,0 +1,93 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Ivan Kopeykin @vankop
+*/
+
+"use strict";
+
+const IgnoreErrorModuleFactory = require("./IgnoreErrorModuleFactory");
+const {
+	JAVASCRIPT_MODULE_TYPE_AUTO,
+	JAVASCRIPT_MODULE_TYPE_DYNAMIC,
+	JAVASCRIPT_MODULE_TYPE_ESM
+} = require("./ModuleTypeConstants");
+const WebpackIsIncludedDependency = require("./dependencies/WebpackIsIncludedDependency");
+const {
+	toConstantDependency
+} = require("./javascript/JavascriptParserHelpers");
+
+/** @typedef {import("./Compiler")} Compiler */
+/** @typedef {import("./Dependency").DependencyLocation} DependencyLocation */
+/** @typedef {import("./javascript/JavascriptParser")} JavascriptParser */
+/** @typedef {import("./javascript/JavascriptParser").Range} Range */
+
+const PLUGIN_NAME = "WebpackIsIncludedPlugin";
+
+class WebpackIsIncludedPlugin {
+	/**
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap(
+			PLUGIN_NAME,
+			(compilation, { normalModuleFactory }) => {
+				compilation.dependencyFactories.set(
+					WebpackIsIncludedDependency,
+					new IgnoreErrorModuleFactory(normalModuleFactory)
+				);
+				compilation.dependencyTemplates.set(
+					WebpackIsIncludedDependency,
+					new WebpackIsIncludedDependency.Template()
+				);
+
+				/**
+				 * @param {JavascriptParser} parser the parser
+				 * @returns {void}
+				 */
+				const handler = (parser) => {
+					parser.hooks.call
+						.for("__webpack_is_included__")
+						.tap(PLUGIN_NAME, (expr) => {
+							if (
+								expr.type !== "CallExpression" ||
+								expr.arguments.length !== 1 ||
+								expr.arguments[0].type === "SpreadElement"
+							) {
+								return;
+							}
+
+							const request = parser.evaluateExpression(expr.arguments[0]);
+
+							if (!request.isString()) return;
+
+							const dep = new WebpackIsIncludedDependency(
+								/** @type {string} */ (request.string),
+								/** @type {Range} */ (expr.range)
+							);
+							dep.loc = /** @type {DependencyLocation} */ (expr.loc);
+							parser.state.module.addDependency(dep);
+							return true;
+						});
+					parser.hooks.typeof
+						.for("__webpack_is_included__")
+						.tap(
+							PLUGIN_NAME,
+							toConstantDependency(parser, JSON.stringify("function"))
+						);
+				};
+				normalModuleFactory.hooks.parser
+					.for(JAVASCRIPT_MODULE_TYPE_AUTO)
+					.tap(PLUGIN_NAME, handler);
+				normalModuleFactory.hooks.parser
+					.for(JAVASCRIPT_MODULE_TYPE_DYNAMIC)
+					.tap(PLUGIN_NAME, handler);
+				normalModuleFactory.hooks.parser
+					.for(JAVASCRIPT_MODULE_TYPE_ESM)
+					.tap(PLUGIN_NAME, handler);
+			}
+		);
+	}
+}
+
+module.exports = WebpackIsIncludedPlugin;