feat: Add Rod-based browser automation for OAuth authorization.

backend/internal/auth/rod.go

@@ -2,6 +2,7 @@ package auth
 
 import (
 	"fmt"
+	"os"
 	"strings"
 	"time"
 
@@ -18,6 +19,34 @@ type RodAuth struct {
 	proxy    string
 }
 
+// getChromiumPath 获取 Chromium 路径
+func getChromiumPath() string {
+	// 优先使用环境变量
+	if path := os.Getenv("CHROME_BIN"); path != "" {
+		if _, err := os.Stat(path); err == nil {
+			return path
+		}
+	}
+	if path := os.Getenv("CHROME_PATH"); path != "" {
+		if _, err := os.Stat(path); err == nil {
+			return path
+		}
+	}
+	// Alpine Linux 默认路径
+	paths := []string{
+		"/usr/bin/chromium-browser",
+		"/usr/bin/chromium",
+		"/usr/bin/google-chrome",
+		"/usr/bin/google-chrome-stable",
+	}
+	for _, path := range paths {
+		if _, err := os.Stat(path); err == nil {
+			return path
+		}
+	}
+	return "" // 让 Rod 自动下载
+}
+
 // NewRodAuth 创建 Rod 授权器
 func NewRodAuth(headless bool, proxy string) (*RodAuth, error) {
 	l := launcher.New().
@@ -33,6 +62,11 @@ func NewRodAuth(headless bool, proxy string) (*RodAuth, error) {
 		Set("metrics-recording-only").
 		Set("no-first-run")
 
+	// 使用系统 Chromium（如果存在）
+	if chromiumPath := getChromiumPath(); chromiumPath != "" {
+		l = l.Bin(chromiumPath)
+	}
+
 	if proxy != "" {
 		l = l.Proxy(proxy)
 	}