优化跟单过滤逻辑和卖出价格计算

- 优化订单簿请求：仅在需要时请求，避免不必要的API调用
- 卖出价格改为市价卖出：优先使用订单簿bestBid，失败则使用Leader价格，固定按90%计算
- 价格容忍度默认值：如果为0，自动使用5%
- 使用枚举和数据类优化checkFilters方法：
  - 新增FilterResult数据类和FilterStatus枚举
  - 移除无用字段isBuyOrder参数
  - 使用类型安全的枚举替代字符串判断
- 优化代码结构：减少if-else嵌套，使用链式调用
- 移除最小订单簿深度功能（minOrderbookDepth）
- 优化最小订单深度逻辑：检查所有方向（买盘+卖盘）的总深度

frontend/src/locales/en/common.json

@@ -597,10 +597,10 @@
     "priceToleranceTooltip": "Allowed adjustment range for copy price based on Leader price, used to adjust price within Leader price ± tolerance range to improve fill rate. For example: set to 5%, Leader price is 0.5, then copy price can be in 0.475-0.525 range.",
     "priceTolerancePlaceholder": "Default 5% (optional)",
     "minOrderDepth": "Min Order Depth (USDC)",
-    "minOrderDepthTooltip": "Minimum order depth (USDC amount), NULL means this filter is not enabled. Ensures market has sufficient liquidity",
+    "minOrderDepthTooltip": "Check total order amount (bids + asks) in orderbook to ensure sufficient liquidity. Leave empty to disable",
     "minOrderDepthPlaceholder": "For example: 100 (optional, leave empty to disable)",
     "maxSpread": "Max Spread (Absolute Price)",
-    "maxSpreadTooltip": "Maximum spread (absolute price), NULL means this filter is not enabled. Avoid copying in markets with excessive spreads",
+    "maxSpreadTooltip": "Maximum spread (absolute price). Avoid copying in markets with excessive spreads. Leave empty to disable",
     "maxSpreadPlaceholder": "For example: 0.05 (5 cents, optional, leave empty to disable)",
     "minOrderbookDepth": "Min Orderbook Depth (USDC)",
     "minOrderbookDepthTooltip": "Minimum orderbook depth (USDC amount), NULL means this filter is not enabled. Check depth of first N levels",
@@ -654,10 +654,10 @@
     "priceToleranceTooltip": "Allowed adjustment range for copy price based on Leader price, used to adjust price within Leader price ± tolerance range to improve fill rate. For example: set to 5%, Leader price is 0.5, then copy price can be in 0.475-0.525 range.",
     "priceTolerancePlaceholder": "Default 5% (optional)",
     "minOrderDepth": "Min Order Depth (USDC)",
-    "minOrderDepthTooltip": "Minimum order depth (USDC amount), NULL means this filter is not enabled. Ensures market has sufficient liquidity",
+    "minOrderDepthTooltip": "Check total order amount (bids + asks) in orderbook to ensure sufficient liquidity. Leave empty to disable",
     "minOrderDepthPlaceholder": "For example: 100 (optional, leave empty to disable)",
     "maxSpread": "Max Spread (Absolute Price)",
-    "maxSpreadTooltip": "Maximum spread (absolute price), NULL means this filter is not enabled. Avoid copying in markets with excessive spreads",
+    "maxSpreadTooltip": "Maximum spread (absolute price). Avoid copying in markets with excessive spreads. Leave empty to disable",
     "maxSpreadPlaceholder": "For example: 0.05 (5 cents, optional, leave empty to disable)",
     "minOrderbookDepth": "Min Orderbook Depth (USDC)",
     "minOrderbookDepthTooltip": "Minimum orderbook depth (USDC amount), NULL means this filter is not enabled. Check depth of first N levels",
@@ -719,10 +719,10 @@
     "delaySecondsPlaceholder": "Default 0 (copy immediately)",
     "filterConditions": "Filter Conditions (Optional)",
     "minOrderDepth": "Min Order Depth (USDC)",
-    "minOrderDepthTooltip": "Minimum order depth (USDC amount), NULL means this filter is not enabled. Ensures market has sufficient liquidity",
+    "minOrderDepthTooltip": "Check total order amount (bids + asks) in orderbook to ensure sufficient liquidity. Leave empty to disable",
     "minOrderDepthPlaceholder": "For example: 100 (optional, leave empty to disable)",
     "maxSpread": "Max Spread (Absolute Price)",
-    "maxSpreadTooltip": "Maximum spread (absolute price), NULL means this filter is not enabled. Avoid copying in markets with excessive spreads",
+    "maxSpreadTooltip": "Maximum spread (absolute price). Avoid copying in markets with excessive spreads. Leave empty to disable",
     "maxSpreadPlaceholder": "For example: 0.05 (5 cents, optional, leave empty to disable)",
     "minOrderbookDepth": "Min Orderbook Depth (USDC)",
     "minOrderbookDepthTooltip": "Minimum orderbook depth (USDC amount), NULL means this filter is not enabled. Check depth of first N levels",
@@ -794,10 +794,10 @@
     "delaySecondsPlaceholder": "Default 0 (copy immediately)",
     "filterConditions": "Filter Conditions (Optional)",
     "minOrderDepth": "Min Order Depth (USDC)",
-    "minOrderDepthTooltip": "Minimum order depth (USDC amount), NULL means this filter is not enabled",
+    "minOrderDepthTooltip": "Check total order amount (bids + asks) in orderbook to ensure sufficient liquidity. Leave empty to disable",
     "minOrderDepthPlaceholder": "For example: 100 (optional, leave empty to disable)",
     "maxSpread": "Max Spread (Absolute Price)",
-    "maxSpreadTooltip": "Maximum spread (absolute price), NULL means this filter is not enabled",
+    "maxSpreadTooltip": "Maximum spread (absolute price). Avoid copying in markets with excessive spreads. Leave empty to disable",
     "maxSpreadPlaceholder": "For example: 0.05 (5 cents, optional, leave empty to disable)",
     "minOrderbookDepth": "Min Orderbook Depth (USDC)",
     "minOrderbookDepthTooltip": "Minimum orderbook depth (USDC amount), NULL means this filter is not enabled",

frontend/src/locales/zh-CN/common.json

@@ -512,10 +512,10 @@
     "priceToleranceTooltip": "允许跟单价格在 Leader 价格基础上的调整范围，用于在 Leader 价格 ± 容忍度范围内调整价格，提高成交率。例如：设置为 5%，Leader 价格为 0.5，则跟单价格可在 0.475-0.525 范围内。",
     "priceTolerancePlaceholder": "默认 5%（可选）",
     "minOrderDepth": "最小订单深度 (USDC)",
-    "minOrderDepthTooltip": "最小订单深度（USDC金额），NULL表示不启用此过滤。确保市场有足够的流动性",
+    "minOrderDepthTooltip": "检查订单簿的总订单金额（买盘+卖盘），确保市场有足够的流动性。不填写则不启用此过滤",
     "minOrderDepthPlaceholder": "例如：100（可选，不填写表示不启用）",
     "maxSpread": "最大价差（绝对价格）",
-    "maxSpreadTooltip": "最大价差（绝对价格），NULL表示不启用此过滤。避免在价差过大的市场跟单",
+    "maxSpreadTooltip": "最大价差（绝对价格）。避免在价差过大的市场跟单。不填写则不启用此过滤",
     "maxSpreadPlaceholder": "例如：0.05（5美分，可选，不填写表示不启用）",
     "minOrderbookDepth": "最小订单簿深度 (USDC)",
     "minOrderbookDepthTooltip": "最小订单簿深度（USDC金额），NULL表示不启用此过滤。检查前 N 档的深度",
@@ -569,10 +569,10 @@
     "priceToleranceTooltip": "允许跟单价格在 Leader 价格基础上的调整范围，用于在 Leader 价格 ± 容忍度范围内调整价格，提高成交率。例如：设置为 5%，Leader 价格为 0.5，则跟单价格可在 0.475-0.525 范围内。",
     "priceTolerancePlaceholder": "默认 5%（可选）",
     "minOrderDepth": "最小订单深度 (USDC)",
-    "minOrderDepthTooltip": "最小订单深度（USDC金额），NULL表示不启用此过滤。确保市场有足够的流动性",
+    "minOrderDepthTooltip": "检查订单簿的总订单金额（买盘+卖盘），确保市场有足够的流动性。不填写则不启用此过滤",
     "minOrderDepthPlaceholder": "例如：100（可选，不填写表示不启用）",
     "maxSpread": "最大价差（绝对价格）",
-    "maxSpreadTooltip": "最大价差（绝对价格），NULL表示不启用此过滤。避免在价差过大的市场跟单",
+    "maxSpreadTooltip": "最大价差（绝对价格）。避免在价差过大的市场跟单。不填写则不启用此过滤",
     "maxSpreadPlaceholder": "例如：0.05（5美分，可选，不填写表示不启用）",
     "minOrderbookDepth": "最小订单簿深度 (USDC)",
     "minOrderbookDepthTooltip": "最小订单簿深度（USDC金额），NULL表示不启用此过滤。检查前 N 档的深度",
@@ -646,10 +646,10 @@
     "delaySecondsPlaceholder": "默认 0（立即跟单）",
     "filterConditions": "过滤条件（可选）",
     "minOrderDepth": "最小订单深度 (USDC)",
-    "minOrderDepthTooltip": "最小订单深度（USDC金额），NULL表示不启用此过滤。确保市场有足够的流动性",
+    "minOrderDepthTooltip": "检查订单簿的总订单金额（买盘+卖盘），确保市场有足够的流动性。不填写则不启用此过滤",
     "minOrderDepthPlaceholder": "例如：100（可选，不填写表示不启用）",
     "maxSpread": "最大价差（绝对价格）",
-    "maxSpreadTooltip": "最大价差（绝对价格），NULL表示不启用此过滤。避免在价差过大的市场跟单",
+    "maxSpreadTooltip": "最大价差（绝对价格）。避免在价差过大的市场跟单。不填写则不启用此过滤",
     "maxSpreadPlaceholder": "例如：0.05（5美分，可选，不填写表示不启用）",
     "minOrderbookDepth": "最小订单簿深度 (USDC)",
     "minOrderbookDepthTooltip": "最小订单簿深度（USDC金额），NULL表示不启用此过滤。检查前 N 档的深度",
@@ -721,10 +721,10 @@
     "delaySecondsPlaceholder": "默认 0（立即跟单）",
     "filterConditions": "过滤条件（可选）",
     "minOrderDepth": "最小订单深度 (USDC)",
-    "minOrderDepthTooltip": "最小订单深度（USDC金额），NULL表示不启用此过滤",
+    "minOrderDepthTooltip": "检查订单簿的总订单金额（买盘+卖盘），确保市场有足够的流动性。不填写则不启用此过滤",
     "minOrderDepthPlaceholder": "例如：100（可选，不填写表示不启用）",
     "maxSpread": "最大价差（绝对价格）",
-    "maxSpreadTooltip": "最大价差（绝对价格），NULL表示不启用此过滤",
+    "maxSpreadTooltip": "最大价差（绝对价格）。避免在价差过大的市场跟单。不填写则不启用此过滤",
     "maxSpreadPlaceholder": "例如：0.05（5美分，可选，不填写表示不启用）",
     "minOrderbookDepth": "最小订单簿深度 (USDC)",
     "minOrderbookDepthTooltip": "最小订单簿深度（USDC金额），NULL表示不启用此过滤",

frontend/src/locales/zh-TW/common.json

@@ -597,10 +597,10 @@
     "priceToleranceTooltip": "允許跟單價格在 Leader 價格基礎上的調整範圍，用於在 Leader 價格 ± 容忍度範圍內調整價格，提高成交率。例如：設置為 5%，Leader 價格為 0.5，則跟單價格可在 0.475-0.525 範圍內。",
     "priceTolerancePlaceholder": "默認 5%（可選）",
     "minOrderDepth": "最小訂單深度 (USDC)",
-    "minOrderDepthTooltip": "最小訂單深度（USDC金額），NULL表示不啟用此過濾。確保市場有足夠的流動性",
+    "minOrderDepthTooltip": "檢查訂單簿的總訂單金額（買盤+賣盤），確保市場有足夠的流動性。不填寫則不啟用此過濾",
     "minOrderDepthPlaceholder": "例如：100（可選，不填寫表示不啟用）",
     "maxSpread": "最大價差（絕對價格）",
-    "maxSpreadTooltip": "最大價差（絕對價格），NULL表示不啟用此過濾。避免在價差過大的市場跟單",
+    "maxSpreadTooltip": "最大價差（絕對價格）。避免在價差過大的市場跟單。不填寫則不啟用此過濾",
     "maxSpreadPlaceholder": "例如：0.05（5美分，可選，不填寫表示不啟用）",
     "minOrderbookDepth": "最小訂單簿深度 (USDC)",
     "minOrderbookDepthTooltip": "最小訂單簿深度（USDC金額），NULL表示不啟用此過濾。檢查前 N 檔的深度",
@@ -654,10 +654,10 @@
     "priceToleranceTooltip": "允許跟單價格在 Leader 價格基礎上的調整範圍，用於在 Leader 價格 ± 容忍度範圍內調整價格，提高成交率。例如：設置為 5%，Leader 價格為 0.5，則跟單價格可在 0.475-0.525 範圍內。",
     "priceTolerancePlaceholder": "默認 5%（可選）",
     "minOrderDepth": "最小訂單深度 (USDC)",
-    "minOrderDepthTooltip": "最小訂單深度（USDC金額），NULL表示不啟用此過濾。確保市場有足夠的流動性",
+    "minOrderDepthTooltip": "檢查訂單簿的總訂單金額（買盤+賣盤），確保市場有足夠的流動性。不填寫則不啟用此過濾",
     "minOrderDepthPlaceholder": "例如：100（可選，不填寫表示不啟用）",
     "maxSpread": "最大價差（絕對價格）",
-    "maxSpreadTooltip": "最大價差（絕對價格），NULL表示不啟用此過濾。避免在價差過大的市場跟單",
+    "maxSpreadTooltip": "最大價差（絕對價格）。避免在價差過大的市場跟單。不填寫則不啟用此過濾",
     "maxSpreadPlaceholder": "例如：0.05（5美分，可選，不填寫表示不啟用）",
     "minOrderbookDepth": "最小訂單簿深度 (USDC)",
     "minOrderbookDepthTooltip": "最小訂單簿深度（USDC金額），NULL表示不啟用此過濾。檢查前 N 檔的深度",
@@ -719,10 +719,10 @@
     "delaySecondsPlaceholder": "默認 0（立即跟單）",
     "filterConditions": "過濾條件（可選）",
     "minOrderDepth": "最小訂單深度 (USDC)",
-    "minOrderDepthTooltip": "最小訂單深度（USDC金額），NULL表示不啟用此過濾。確保市場有足夠的流動性",
+    "minOrderDepthTooltip": "檢查訂單簿的總訂單金額（買盤+賣盤），確保市場有足夠的流動性。不填寫則不啟用此過濾",
     "minOrderDepthPlaceholder": "例如：100（可選，不填寫表示不啟用）",
     "maxSpread": "最大價差（絕對價格）",
-    "maxSpreadTooltip": "最大價差（絕對價格），NULL表示不啟用此過濾。避免在價差過大的市場跟單",
+    "maxSpreadTooltip": "最大價差（絕對價格）。避免在價差過大的市場跟單。不填寫則不啟用此過濾",
     "maxSpreadPlaceholder": "例如：0.05（5美分，可選，不填寫表示不啟用）",
     "minOrderbookDepth": "最小訂單簿深度 (USDC)",
     "minOrderbookDepthTooltip": "最小訂單簿深度（USDC金額），NULL表示不啟用此過濾。檢查前 N 檔的深度",
@@ -794,10 +794,10 @@
     "delaySecondsPlaceholder": "默認 0（立即跟單）",
     "filterConditions": "過濾條件（可選）",
     "minOrderDepth": "最小訂單深度 (USDC)",
-    "minOrderDepthTooltip": "最小訂單深度（USDC金額），NULL表示不啟用此過濾",
+    "minOrderDepthTooltip": "檢查訂單簿的總訂單金額（買盤+賣盤），確保市場有足夠的流動性。不填寫則不啟用此過濾",
     "minOrderDepthPlaceholder": "例如：100（可選，不填寫表示不啟用）",
     "maxSpread": "最大價差（絕對價格）",
-    "maxSpreadTooltip": "最大價差（絕對價格），NULL表示不啟用此過濾",
+    "maxSpreadTooltip": "最大價差（絕對價格）。避免在價差過大的市場跟單。不填寫則不啟用此過濾",
     "maxSpreadPlaceholder": "例如：0.05（5美分，可選，不填寫表示不啟用）",
     "minOrderbookDepth": "最小訂單簿深度 (USDC)",
     "minOrderbookDepthTooltip": "最小訂單簿深度（USDC金額），NULL表示不啟用此過濾",