v0.3.12: 统一环境变量管理 + 去重

- CHROMIUM_PATH 从3处散落移到 config/index.ts 统一管理
- startup-validator 移除冗余 CORS_ORIGIN 检查 (main.ts 已处理)
- docker run 补充 JWT_SECRET/ADMIN_PASSWORD/COOKIE_ENCRYPTION_KEY
- 云盘常量统一到 cloud-constants.ts (图标/标签/颜色)

source_clean/src/cloud/drivers/baidu.driver.ts

@@ -37,7 +37,8 @@ interface ShareDetail {
 //  Constants
 // ═══════════════════════════════════
 const API_HOST      = "https://pan.baidu.com";
-const CHROMIUM_PATH = process.env.CHROMIUM_PATH || "/usr/bin/chromium-browser";
+import config from '../../config';
+const CHROMIUM_PATH = config.chromiumPath;
 const APP_ID_WEB    = "38824127";  // Web app ID from BaiduPanFilesTransfers
 
 // HTTP headers matching BaiduPanFilesTransfers