docs: add MIT LICENSE and .dev.vars.example referenced by README

Co-authored-by: Cursor <cursoragent@cursor.com>

.dev.vars.example

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+# Wrangler 本地开发密钥（复制为 .dev.vars 后填写真实值）
+# cp .dev.vars.example .dev.vars
+
+# GitHub Personal Access Token，权限至少包含 repo、workflow
+GITHUB_TOKEN=ghp_xxx
+
+# 用于接收构建产物的 GitHub 仓库
+GITHUB_OWNER=your-github-username
+GITHUB_REPO=Web2App
+
+# 触发 workflow 的默认分支（需与仓库默认分支一致）
+DEFAULT_BRANCH=main
+
+# 单次上传 zip 的最大体积（MB）
+MAX_UPLOAD_MB=50

LICENSE

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+MIT License
+
+Copyright (c) 2026 shumengya
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.