Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/internal/service/gemini_oauth.go

@@ -0,0 +1,13 @@
+package service
+
+import (
+	"context"
+
+	"github.com/Wei-Shaw/sub2api/internal/pkg/geminicli"
+)
+
+// GeminiOAuthClient performs Google OAuth token exchange/refresh for Gemini integration.
+type GeminiOAuthClient interface {
+	ExchangeCode(ctx context.Context, oauthType, code, codeVerifier, redirectURI, proxyURL string) (*geminicli.TokenResponse, error)
+	RefreshToken(ctx context.Context, oauthType, refreshToken, proxyURL string) (*geminicli.TokenResponse, error)
+}