feat(steady): 完善稳态数据视图功能

- 更新纵坐标刻度算法，优化小数趋势图范围显示
- 添加稳态趋势图全屏模式和共享工具组件
- 实现多图联动的鼠标悬停竖线同步功能
- 调整主线线宽分档策略，降低最大线宽限制
- 重构稳态趋势工具栏，优化谐波次数选择逻辑
- 添加周时间周期搜索支持和自定义时间范围选择
- 完善稳态数据表格和指示器浮动面板功能
- 优化稳态趋势图性能，添加LTB采样和动画控制
- 修复数据表格打开前的趋势数据验证问题
- 统一时间轴标签格式化和网格对齐处理

frontend/src/api/steady/steadyTrend/interface/index.ts

@@ -0,0 +1,77 @@
+export namespace SteadyTrend {
+    export interface SteadyLedgerNode {
+        id: string
+        parentId?: string
+        name: string
+        level: 0 | 1 | 2 | 3
+        sort?: number
+        deviceCount?: number
+        lineCount?: number
+        selectable?: boolean
+        children?: SteadyLedgerNode[]
+    }
+
+    export interface SteadyIndicatorSeriesField {
+        field: string
+        name: string
+    }
+
+    export interface SteadyIndicatorNode {
+        id?: string
+        treeKey?: string
+        indicatorCode?: string
+        name: string
+        groupCode?: string
+        tableName?: string
+        baseFields?: string[]
+        phaseCodes?: string[]
+        seriesFields?: SteadyIndicatorSeriesField[]
+        supportStats?: SteadyTrendStatType[]
+        harmonic?: boolean
+        harmonicOrderStart?: number | null
+        harmonicOrderEnd?: number | null
+        unit?: string
+        children?: SteadyIndicatorNode[]
+    }
+
+    export type SteadyTrendStatType = 'AVG' | 'MAX' | 'MIN' | 'CP95'
+
+    export interface SteadyTrendQueryParams {
+        lineIds: string[]
+        indicatorCodes: string[]
+        statTypes: SteadyTrendStatType[]
+        timeStart: string
+        timeEnd: string
+        qualityFlag?: number
+        harmonicOrders?: number[]
+    }
+
+    export interface SteadyTrendPoint {
+        time: string
+        value: number | null
+    }
+
+    export interface SteadyTrendSeries {
+        seriesKey: string
+        lineId: string
+        lineName?: string
+        indicatorCode: string
+        indicatorName?: string
+        seriesName?: string
+        phase?: string
+        harmonicOrder?: number
+        statType?: SteadyTrendStatType
+        unit?: string
+        points: SteadyTrendPoint[]
+    }
+
+    export interface SteadyTrendQueryResult {
+        sampled?: boolean
+        bucket?: string
+        sourcePointCount?: number
+        displayPointCount?: number
+        loadableDays?: string[]
+        series: SteadyTrendSeries[]
+    }
+
+}