feat: 增加 GitHub 和 Google 邮箱快捷登录

backend/internal/server/middleware/backend_mode_guard.go

@@ -40,6 +40,8 @@ func backendModeAllowsAuthPath(path string) bool {
 		"/auth/oauth/wechat/callback",
 		"/auth/oauth/wechat/payment/callback",
 		"/auth/oauth/oidc/callback",
+		"/auth/oauth/github/callback",
+		"/auth/oauth/google/callback",
 		"/auth/oauth/linuxdo/complete-registration",
 		"/auth/oauth/wechat/complete-registration",
 		"/auth/oauth/oidc/complete-registration",

backend/internal/server/middleware/backend_mode_guard_test.go

@@ -246,6 +246,30 @@ func TestBackendModeAuthGuard(t *testing.T) {
 			path:       "/api/v1/auth/oauth/oidc/callback",
 			wantStatus: http.StatusOK,
 		},
+		{
+			name:       "enabled_blocks_github_oauth_start",
+			enabled:    "true",
+			path:       "/api/v1/auth/oauth/github/start",
+			wantStatus: http.StatusForbidden,
+		},
+		{
+			name:       "enabled_allows_github_oauth_callback",
+			enabled:    "true",
+			path:       "/api/v1/auth/oauth/github/callback",
+			wantStatus: http.StatusOK,
+		},
+		{
+			name:       "enabled_blocks_google_oauth_start",
+			enabled:    "true",
+			path:       "/api/v1/auth/oauth/google/start",
+			wantStatus: http.StatusForbidden,
+		},
+		{
+			name:       "enabled_allows_google_oauth_callback",
+			enabled:    "true",
+			path:       "/api/v1/auth/oauth/google/callback",
+			wantStatus: http.StatusOK,
+		},
 		{
 			name:       "enabled_allows_oauth_pending_exchange",
 			enabled:    "true",