fix: show websearch API key visibility/copy buttons for saved providers

The buttons were hidden because v-if only checked provider.api_key,
which is always empty for saved providers (backend sanitizes it).
Now also checks api_key_configured. Copy button is disabled when
no actual key is available (only configured placeholder shown).

backend/cmd/server/VERSION

@@ -1 +1 @@
-0.1.110.51
+0.1.112.3

backend/internal/handler/admin/setting_handler.go

@@ -1939,7 +1939,7 @@ func (h *SettingHandler) GetWebSearchEmulationConfig(c *gin.Context) {
 		response.ErrorFrom(c, err)
 		return
 	}
-	response.Success(c, service.SanitizeWebSearchConfig(c.Request.Context(), cfg))
+	response.Success(c, service.PopulateWebSearchUsage(c.Request.Context(), cfg))
 }
 
 // UpdateWebSearchEmulationConfig 更新 Web Search 模拟配置

backend/internal/service/websearch_config.go

@@ -277,6 +277,28 @@ func TestWebSearch(ctx context.Context, query string) (*WebSearchTestResult, err
 	}, nil
 }
 
+// PopulateWebSearchUsage returns a copy with quota usage populated from Redis (api_key kept as-is).
+func PopulateWebSearchUsage(ctx context.Context, cfg *WebSearchEmulationConfig) *WebSearchEmulationConfig {
+	if cfg == nil {
+		return nil
+	}
+	out := *cfg
+	out.Providers = make([]WebSearchProviderConfig, len(cfg.Providers))
+
+	mgr := getWebSearchManager()
+
+	for i, p := range cfg.Providers {
+		out.Providers[i] = p
+		out.Providers[i].APIKeyConfigured = p.APIKey != ""
+
+		if mgr != nil {
+			used, _ := mgr.GetUsage(ctx, p.Type)
+			out.Providers[i].QuotaUsed = used
+		}
+	}
+	return &out
+}
+
 // SanitizeWebSearchConfig returns a copy with api_key fields masked and quota usage populated.
 func SanitizeWebSearchConfig(ctx context.Context, cfg *WebSearchEmulationConfig) *WebSearchEmulationConfig {
 	if cfg == nil {