feat: 回测任务支持价格区间过滤

- 后端：
  - BacktestTask 实体类添加 minPrice 和 maxPrice 字段
  - BacktestDto 添加价格区间参数和配置字段
  - BacktestService 支持创建和查询价格区间配置
  - BacktestExecutionService 在 taskToCopyTrading 中设置价格区间
  - 添加数据库迁移脚本 V32__add_backtest_price_range_filter.sql

- 前端：
  - BacktestList 添加价格区间输入表单（最低价、最高价）
  - 详情页面显示价格区间配置
  - 一键创建跟单配置时包含价格区间
  - 添加中英繁三语言翻译
  - 修复价格输入框精度显示问题（0.4 不再显示为 0.40000000）

功能说明：
- 价格区间过滤与跟单配置保持一致，确保回测结果能准确反映实际跟单效果
- 支持只设置最低价、只设置最高价、或同时设置两者
- 留空表示不限制价格

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/locales/en/common.json

@@ -1363,6 +1363,10 @@
     "fixedAmountRequired": "Please enter fixed amount",
     "fixedAmountInvalid": "Fixed amount must be greater than 0",
     "priceFilters": "Price Filters",
+    "priceRange": "Price Range",
+    "priceRangeTooltip": "Only copy Leader orders with price within the specified range. Leave empty to disable. Example: Enter 0.11 and 0.89 to only copy orders with price between 0.11 and 0.89; enter only max price 0.89 to only copy orders with price below 0.89; enter only min price 0.11 to only copy orders with price above 0.11.",
+    "minPricePlaceholder": "Min price (leave empty to disable)",
+    "maxPricePlaceholder": "Max price (leave empty to disable)",
     "keywordsPlaceholder": "Please enter keywords, press Enter to add",
     "maxPositionValuePlaceholder": "Leave empty to disable max position limit",
     "delaySecondsHint": "Delay execution to simulate real copy trading delay",