📦 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/yaml/browser/index.js

@@ -0,0 +1 @@
+module.exports = require('./dist').YAML

frontend/node_modules/yaml/browser/map.js

@@ -0,0 +1,2 @@
+module.exports = require('./dist/types').YAMLMap
+require('./dist/legacy-exports').warnFileDeprecation(__filename)

frontend/node_modules/yaml/browser/pair.js

@@ -0,0 +1,2 @@
+module.exports = require('./dist/types').Pair
+require('./dist/legacy-exports').warnFileDeprecation(__filename)

frontend/node_modules/yaml/browser/parse-cst.js

@@ -0,0 +1 @@
+module.exports = require('./dist/parse-cst').parse

frontend/node_modules/yaml/browser/scalar.js

@@ -0,0 +1,2 @@
+module.exports = require('./dist/types').Scalar
+require('./dist/legacy-exports').warnFileDeprecation(__filename)

frontend/node_modules/yaml/browser/schema.js

@@ -0,0 +1,9 @@
+const types = require('./dist/types')
+const util = require('./dist/util')
+
+module.exports = types.Schema
+module.exports.nullOptions = types.nullOptions
+module.exports.strOptions = types.strOptions
+module.exports.stringify = util.stringifyString
+
+require('./dist/legacy-exports').warnFileDeprecation(__filename)

frontend/node_modules/yaml/browser/seq.js

@@ -0,0 +1,2 @@
+module.exports = require('./dist/types').YAMLSeq
+require('./dist/legacy-exports').warnFileDeprecation(__filename)

frontend/node_modules/yaml/browser/types.js

@@ -0,0 +1 @@
+module.exports = require('./dist/types')

frontend/node_modules/yaml/browser/types/binary.js

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+'use strict'
+Object.defineProperty(exports, '__esModule', { value: true })
+
+const legacy = require('../dist/legacy-exports')
+exports.binary = legacy.binary
+exports.default = [exports.binary]
+
+legacy.warnFileDeprecation(__filename)

frontend/node_modules/yaml/browser/types/omap.js

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+const legacy = require('../dist/legacy-exports')
+module.exports = legacy.omap
+legacy.warnFileDeprecation(__filename)

frontend/node_modules/yaml/browser/types/pairs.js

@@ -0,0 +1,3 @@
+const legacy = require('../dist/legacy-exports')
+module.exports = legacy.pairs
+legacy.warnFileDeprecation(__filename)

frontend/node_modules/yaml/browser/types/set.js

@@ -0,0 +1,3 @@
+const legacy = require('../dist/legacy-exports')
+module.exports = legacy.set
+legacy.warnFileDeprecation(__filename)

frontend/node_modules/yaml/browser/types/timestamp.js

@@ -0,0 +1,10 @@
+'use strict'
+Object.defineProperty(exports, '__esModule', { value: true })
+
+const legacy = require('../dist/legacy-exports')
+exports.default = [legacy.intTime, legacy.floatTime, legacy.timestamp]
+exports.floatTime = legacy.floatTime
+exports.intTime = legacy.intTime
+exports.timestamp = legacy.timestamp
+
+legacy.warnFileDeprecation(__filename)

frontend/node_modules/yaml/browser/util.js

@@ -0,0 +1 @@
+module.exports = require('./dist/util')