fix(backend): 修复 rebase 后的代码集成问题

- 更新 middleware import 路径到 internal/server/middleware
- 修复 api_key_auth_google.go 使用正确的 service 类型
- 更新 router.go 和 http.go 支持 Gemini v1beta 路由
- 在 routes/gateway.go 中添加 Gemini v1beta API 端点
- 在 routes/admin.go 中添加 Gemini OAuth 路由
- 更新 wire.go 添加 GeminiOAuthService cleanup
- 重新生成 wire_gen.go

backend/internal/server/routes/gateway.go

@@ -3,15 +3,18 @@ package routes
 import (
 	"github.com/Wei-Shaw/sub2api/internal/handler"
 	"github.com/Wei-Shaw/sub2api/internal/server/middleware"
+	"github.com/Wei-Shaw/sub2api/internal/service"
 
 	"github.com/gin-gonic/gin"
 )
 
-// RegisterGatewayRoutes 注册 API 网关路由（Claude/OpenAI 兼容）
+// RegisterGatewayRoutes 注册 API 网关路由（Claude/OpenAI/Gemini 兼容）
 func RegisterGatewayRoutes(
 	r *gin.Engine,
 	h *handler.Handlers,
 	apiKeyAuth middleware.ApiKeyAuthMiddleware,
+	apiKeyService *service.ApiKeyService,
+	subscriptionService *service.SubscriptionService,
 ) {
 	// API网关（Claude API兼容）
 	gateway := r.Group("/v1")
@@ -25,6 +28,16 @@ func RegisterGatewayRoutes(
 		gateway.POST("/responses", h.OpenAIGateway.Responses)
 	}
 
+	// Gemini 原生 API 兼容层（Gemini SDK/CLI 直连）
+	gemini := r.Group("/v1beta")
+	gemini.Use(middleware.ApiKeyAuthWithSubscriptionGoogle(apiKeyService, subscriptionService))
+	{
+		gemini.GET("/models", h.Gateway.GeminiV1BetaListModels)
+		gemini.GET("/models/:model", h.Gateway.GeminiV1BetaGetModel)
+		// Gin treats ":" as a param marker, but Gemini uses "{model}:{action}" in the same segment.
+		gemini.POST("/models/*modelAction", h.Gateway.GeminiV1BetaModels)
+	}
+
 	// OpenAI Responses API（不带v1前缀的别名）
 	r.POST("/responses", gin.HandlerFunc(apiKeyAuth), h.OpenAIGateway.Responses)
 }