完整重写README并添加Deno部署功能

- 重写README.md为完整的项目文档，包含项目概述、功能特性、快速开始等
- 创建详细的Deno部署指南docs/deno-deployment-guide.md
- 添加Deno Deploy一键部署功能，包含三种部署方式
- 创建deno.json和deno.deploy.json配置文件
- 添加GitHub Actions自动部署工作流
- 更新README中的部署指南部分，突出Deno Deploy一键部署

Author: CassiopeiaCode

.github/workflows/deno-deploy.yml

@@ -0,0 +1,39 @@
+name: Deploy to Deno Deploy
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: main
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    name: Deploy
+    runs-on: ubuntu-latest
+
+    permissions:
+      id-token: write # Needed for auth with Deno Deploy
+      contents: read # Needed to clone the repository
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+
+      - name: Setup Deno
+        uses: denoland/setup-deno@v2
+        with:
+          deno-version: v2.x
+
+      - name: Build project
+        run: |
+          cd deno-proxy
+          deno cache src/main.ts
+          deno check src/main.ts
+
+      - name: Deploy to Deno Deploy
+        uses: denoland/deployctl@v1
+        with:
+          project: "b4u2cc-proxy"
+          entrypoint: "deno-proxy/src/main.ts"
+          root: "."