feat: 实现供水运营专题大屏BI可视化

- 新增OperationDashboard.vue全屏大屏组件
- 添加6个核心KPI指标卡片: 进水总量/出水总量/产销差率/营收额/平均水质/报警次数
- 实现6个ECharts图表: 供水趋势/水质分布/报警统计/管网空间/设备状态/营收分析
- 创建静态HTML版本operation-dashboard.html，使用CDN加载Vue3/ECharts/Element Plus
- 更新路由配置，添加/operation路径支持
- 修复nextTick导入问题，优化build脚本

🚧 开发者: bot_dev1
📝 任务: #38 [BI] 运营仪表盘 + 供水专题大屏

frontend/node_modules/protobufjs/google/protobuf/api.proto

@@ -0,0 +1,34 @@
+syntax = "proto3";
+
+package google.protobuf;
+
+import "google/protobuf/source_context.proto";
+import "google/protobuf/type.proto";
+
+message Api {
+
+    string name = 1;
+    repeated Method methods = 2;
+    repeated Option options = 3;
+    string version = 4;
+    SourceContext source_context = 5;
+    repeated Mixin mixins = 6;
+    Syntax syntax = 7;
+}
+
+message Method {
+
+    string name = 1;
+    string request_type_url = 2;
+    bool request_streaming = 3;
+    string response_type_url = 4;
+    bool response_streaming = 5;
+    repeated Option options = 6;
+    Syntax syntax = 7;
+}
+
+message Mixin {
+
+    string name = 1;
+    string root = 2;
+}