📦 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/camelcase/index.d.ts

@@ -0,0 +1,103 @@
+declare namespace camelcase {
+	interface Options {
+		/**
+		Uppercase the first character: `foo-bar` → `FooBar`.
+
+		@default false
+		*/
+		readonly pascalCase?: boolean;
+
+		/**
+		Preserve the consecutive uppercase characters: `foo-BAR` → `FooBAR`.
+
+		@default false
+		*/
+		readonly preserveConsecutiveUppercase?: boolean;
+
+		/**
+		The locale parameter indicates the locale to be used to convert to upper/lower case according to any locale-specific case mappings. If multiple locales are given in an array, the best available locale is used.
+
+		Setting `locale: false` ignores the platform locale and uses the [Unicode Default Case Conversion](https://unicode-org.github.io/icu/userguide/transforms/casemappings.html#simple-single-character-case-mapping) algorithm.
+
+		Default: The host environment’s current locale.
+
+		@example
+		```
+		import camelCase = require('camelcase');
+
+		camelCase('lorem-ipsum', {locale: 'en-US'});
+		//=> 'loremIpsum'
+		camelCase('lorem-ipsum', {locale: 'tr-TR'});
+		//=> 'loremİpsum'
+		camelCase('lorem-ipsum', {locale: ['en-US', 'en-GB']});
+		//=> 'loremIpsum'
+		camelCase('lorem-ipsum', {locale: ['tr', 'TR', 'tr-TR']});
+		//=> 'loremİpsum'
+		```
+		*/
+		readonly locale?: false | string | readonly string[];
+	}
+}
+
+/**
+Convert a dash/dot/underscore/space separated string to camelCase or PascalCase: `foo-bar` → `fooBar`.
+
+Correctly handles Unicode strings.
+
+@param input - String to convert to camel case.
+
+@example
+```
+import camelCase = require('camelcase');
+
+camelCase('foo-bar');
+//=> 'fooBar'
+
+camelCase('foo_bar');
+//=> 'fooBar'
+
+camelCase('Foo-Bar');
+//=> 'fooBar'
+
+camelCase('розовый_пушистый_единорог');
+//=> 'розовыйПушистыйЕдинорог'
+
+camelCase('Foo-Bar', {pascalCase: true});
+//=> 'FooBar'
+
+camelCase('--foo.bar', {pascalCase: false});
+//=> 'fooBar'
+
+camelCase('Foo-BAR', {preserveConsecutiveUppercase: true});
+//=> 'fooBAR'
+
+camelCase('fooBAR', {pascalCase: true, preserveConsecutiveUppercase: true}));
+//=> 'FooBAR'
+
+camelCase('foo bar');
+//=> 'fooBar'
+
+console.log(process.argv[3]);
+//=> '--foo-bar'
+camelCase(process.argv[3]);
+//=> 'fooBar'
+
+camelCase(['foo', 'bar']);
+//=> 'fooBar'
+
+camelCase(['__foo__', '--bar'], {pascalCase: true});
+//=> 'FooBar'
+
+camelCase(['foo', 'BAR'], {pascalCase: true, preserveConsecutiveUppercase: true})
+//=> 'FooBAR'
+
+camelCase('lorem-ipsum', {locale: 'en-US'});
+//=> 'loremIpsum'
+```
+*/
+declare function camelcase(
+	input: string | readonly string[],
+	options?: camelcase.Options
+): string;
+
+export = camelcase;