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/@cesium/engine/Source/Shaders/CompositeOITFS.glsl

@@ -0,0 +1,31 @@
+/**
+ * Compositing for Weighted Blended Order-Independent Transparency. See:
+ * - http://jcgt.org/published/0002/02/09/
+ * - http://casual-effects.blogspot.com/2014/03/weighted-blended-order-independent.html
+ */
+
+uniform sampler2D u_opaque;
+uniform sampler2D u_accumulation;
+uniform sampler2D u_revealage;
+
+in vec2 v_textureCoordinates;
+
+void main()
+{
+    vec4 opaque = texture(u_opaque, v_textureCoordinates);
+    vec4 accum = texture(u_accumulation, v_textureCoordinates);
+    float r = texture(u_revealage, v_textureCoordinates).r;
+
+#ifdef MRT
+    vec4 transparent = vec4(accum.rgb / clamp(r, 1e-4, 5e4), accum.a);
+#else
+    vec4 transparent = vec4(accum.rgb / clamp(accum.a, 1e-4, 5e4), r);
+#endif
+
+    out_FragColor = (1.0 - transparent.a) * transparent + transparent.a * opaque;
+
+    if (opaque != czm_backgroundColor)
+    {
+        out_FragColor.a = 1.0;
+    }
+}