重构 monorepo 并完善网页端订阅与首页体验

- 迁移为 frontend-web、frontend-electron、backend-web 与 docker 部署结构
- 网页端：订阅门禁二次弹窗、套餐/支付组件化、顶栏分组对齐
- 首页：最近文件与模板库布局优化，缩略图对齐，下载与删除操作
- 新增管理后台、支付与云端文件 API，更新 README 与项目规范

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

docker/sync-config.ps1

@@ -0,0 +1,70 @@
+param([string]$EnvFile = "$PSScriptRoot\.env", [string]$Root = (Split-Path $PSScriptRoot -Parent))
+
+if (-not (Test-Path $EnvFile)) { Copy-Item "$PSScriptRoot\.env.example" $EnvFile }
+
+$ports = @{ WEB_PORT = '8100'; ELECTRON_PORT = '8101'; BACKEND_PORT = '8102' }
+Get-Content $EnvFile -Encoding UTF8 | ForEach-Object {
+    if ($_ -match '^\s*(WEB_PORT|ELECTRON_PORT|BACKEND_PORT)\s*=\s*(\d+)') { $ports[$matches[1]] = $matches[2] }
+}
+$w, $e, $b = $ports.WEB_PORT, $ports.ELECTRON_PORT, $ports.BACKEND_PORT
+
+$deployJs = @"
+window.SOON_DEPLOY_CONFIG = {
+  api_v1_base: 'http://localhost:$b/api/v1',
+  api_admin_base: 'http://localhost:$b/api/admin',
+  front_base_url: 'http://localhost:$w',
+  web_base: 'http://localhost:$w',
+  version: 'local-dev'
+};
+"@
+
+$localPhp = @"
+<?php
+return [
+    'app' => [
+        'env' => 'development',
+        'debug' => true,
+        'timezone' => 'Asia/Shanghai',
+        'jwt_secret' => 'local-dev-jwt-secret-minimum-32-chars',
+        'jwt_ttl' => 3600,
+        'jwt_refresh_ttl' => 2592000,
+        'cors_origins' => [
+            'http://localhost:$w', 'http://127.0.0.1:$w',
+            'http://localhost:$e', 'http://127.0.0.1:$e',
+        ],
+    ],
+    'db' => [
+        'host' => 'mysql', 'port' => 3306, 'name' => 'soondesign',
+        'user' => 'soondesign', 'pass' => 'soondesign', 'charset' => 'utf8mb4',
+    ],
+    'site' => [
+        'base_url' => 'http://localhost:$b',
+        'front_base_url' => 'http://localhost:$w',
+    ],
+    'storage' => [
+        'users_dir' => '/var/www/storage/users',
+        'models_dir' => '/var/soonModels',
+    ],
+    'limits' => ['free_quota_mb' => 20, 'preview_require_membership' => false],
+    'rate_limits' => [
+        'admin/*' => ['capacity' => 120, 'window' => 60],
+        'POST /api/v1/auth/login' => ['capacity' => 10, 'window' => 60],
+        'POST /api/v1/auth/register' => ['capacity' => 5, 'window' => 60],
+        'POST /api/v1/files' => ['capacity' => 30, 'window' => 60],
+    ],
+    'alipay' => ['app_id' => '', 'private_key' => '', 'public_key' => '', 'sandbox' => true],
+    'wechat' => [
+        'app_id' => '', 'mch_id' => '', 'mch_serial_no' => '',
+        'mch_private_key' => '', 'api_v3_key' => '', 'sandbox' => true,
+    ],
+];
+"@
+
+$dir = Join-Path $PSScriptRoot 'config'
+New-Item -ItemType Directory -Force -Path $dir | Out-Null
+$enc = [Text.UTF8Encoding]::new($false)
+[IO.File]::WriteAllText((Join-Path $dir 'deploy-config.js'), $deployJs.Trim() + "`n", $enc)
+[IO.File]::WriteAllText((Join-Path $dir 'local.php'), $localPhp.Trim() + "`n", $enc)
+
+$webDeploy = Join-Path $Root 'frontend-web\assets\deploy-config.js'
+[IO.File]::WriteAllText($webDeploy, $deployJs.Trim() + "`n", $enc)