fix(web,plugin): 前端审计修复 — 401 消除 + 统计卡片 crash + 销售漏斗 500 + antd 6 废弃 API

- API client: proactive token refresh（请求前 30s 检查过期，提前刷新避免 401）
- Plugin store: fetchPlugins promise 去重，防止 StrictMode 并发重复请求
- Home stats: 简化 useEffect 加载逻辑，修复 tagColor undefined crash
- PluginGraphPage: valueStyle → styles.content, Spin tip → description（antd 6）
- DashboardWidgets: trailColor → railColor（antd 6）
- data_service: build_scope_sql 参数索引修复（硬编码 $100 → 动态 values.len()+1）
- erp-core error: Internal 错误添加 tracing::error 日志输出

crates/erp-core/src/error.rs

@@ -50,7 +50,10 @@ impl IntoResponse for AppError {
             AppError::Conflict(_) => (StatusCode::CONFLICT, self.to_string()),
             AppError::VersionMismatch => (StatusCode::CONFLICT, self.to_string()),
             AppError::TooManyRequests => (StatusCode::TOO_MANY_REQUESTS, self.to_string()),
-            AppError::Internal(_) => (StatusCode::INTERNAL_SERVER_ERROR, "内部错误".to_string()),
+            AppError::Internal(msg) => {
+                tracing::error!("Internal error: {}", msg);
+                (StatusCode::INTERNAL_SERVER_ERROR, "内部错误".to_string())
+            }
         };
 
         let body = ErrorResponse {