fix: Forex data source improvements and Tiingo subscription hints

quantdinger_vue/src/locales/lang/en-US.js

@@ -527,6 +527,7 @@ const locale = {
   'dashboard.indicator.error.pleaseLogin': 'Please login first',
   'dashboard.indicator.error.loadDataFailed': 'Failed to load data',
   'dashboard.indicator.error.loadDataFailedDesc': 'Please check network connection',
+  'dashboard.indicator.error.tiingoSubscription': 'Forex 1-minute data requires Tiingo paid subscription. Please use other timeframes or upgrade your subscription.',
   'dashboard.indicator.error.pythonEngineFailed': 'Python engine failed to load, indicator functionality may be unavailable',
   'dashboard.indicator.error.chartInitFailed': 'Chart initialization failed',
   'dashboard.indicator.warning.enterCode': 'Please enter indicator code first',
@@ -2046,7 +2047,9 @@ const locale = {
   // Note: These are optional since backend already provides English descriptions
   'settings.desc.ORDER_MODE': 'maker: Limit order first (lower fees), market: Market order (instant fill)',
   'settings.desc.MAKER_WAIT_SEC': 'Wait time for limit order fill before switching to market order',
-  'settings.desc.MAKER_OFFSET_BPS': 'Price offset in basis points. Buy: price*(1-offset), Sell: price*(1+offset)'
+  'settings.desc.MAKER_OFFSET_BPS': 'Price offset in basis points. Buy: price*(1-offset), Sell: price*(1+offset)',
+  'settings.desc.TIINGO_API_KEY': 'Tiingo API key for Forex/Metals data (free tier does not support 1-minute data)',
+  'settings.desc.TIINGO_TIMEOUT': 'Tiingo API request timeout'
 }
 
 export default {

quantdinger_vue/src/locales/lang/zh-CN.js

@@ -527,6 +527,7 @@ const locale = {
 'dashboard.indicator.error.pleaseLogin': '请先登录',
 'dashboard.indicator.error.loadDataFailed': '数据加载失败',
 'dashboard.indicator.error.loadDataFailedDesc': '请检查网络连接',
+'dashboard.indicator.error.tiingoSubscription': '外汇1分钟数据需要 Tiingo 付费订阅，请使用其他时间周期或升级订阅',
 'dashboard.indicator.error.pythonEngineFailed': 'Python 引擎加载失败，指标功能可能无法使用',
 'dashboard.indicator.error.chartInitFailed': '图表初始化失败',
 'dashboard.indicator.warning.enterCode': '请先输入指标代码',
@@ -1814,7 +1815,7 @@ const locale = {
 'settings.desc.FINNHUB_API_KEY': 'Finnhub API密钥，用于美股数据（有免费额度）',
 'settings.desc.FINNHUB_TIMEOUT': 'Finnhub API请求超时时间',
 'settings.desc.FINNHUB_RATE_LIMIT': 'Finnhub API速率限制（每分钟请求数）',
-'settings.desc.TIINGO_API_KEY': 'Tiingo API密钥，用于美股数据（有免费额度）',
+'settings.desc.TIINGO_API_KEY': 'Tiingo API密钥，用于外汇/贵金属数据（免费版不支持1分钟数据）',
 'settings.desc.TIINGO_TIMEOUT': 'Tiingo API请求超时时间',
 'settings.desc.AKSHARE_TIMEOUT': 'Akshare API超时时间，用于A股数据',
 'settings.desc.YFINANCE_TIMEOUT': 'Yahoo Finance API超时时间',

quantdinger_vue/src/locales/lang/zh-TW.js

@@ -527,6 +527,7 @@ const locale = {
   'dashboard.indicator.error.pleaseLogin': '請先登錄',
   'dashboard.indicator.error.loadDataFailed': '數據加載失敗',
   'dashboard.indicator.error.loadDataFailedDesc': '請檢查網絡連接',
+  'dashboard.indicator.error.tiingoSubscription': '外匯1分鐘數據需要 Tiingo 付費訂閱，請使用其他時間週期或升級訂閱',
   'dashboard.indicator.error.pythonEngineFailed': 'Python 引擎加載失敗，指標功能可能無法使用',
   'dashboard.indicator.error.chartInitFailed': '圖表初始化失敗',
   'dashboard.indicator.warning.enterCode': '請先輸入指標代碼',
@@ -1815,7 +1816,7 @@ const locale = {
   'settings.desc.FINNHUB_API_KEY': 'Finnhub API密鑰，用於美股數據（有免費額度）',
   'settings.desc.FINNHUB_TIMEOUT': 'Finnhub API請求超時時間',
   'settings.desc.FINNHUB_RATE_LIMIT': 'Finnhub API速率限制（每分鐘請求數）',
-  'settings.desc.TIINGO_API_KEY': 'Tiingo API密鑰，用於美股數據（有免費額度）',
+  'settings.desc.TIINGO_API_KEY': 'Tiingo API密鑰，用於外匯/貴金屬數據（免費版不支持1分鐘數據）',
   'settings.desc.TIINGO_TIMEOUT': 'Tiingo API請求超時時間',
   'settings.desc.AKSHARE_TIMEOUT': 'Akshare API超時時間，用於A股數據',
   'settings.desc.YFINANCE_TIMEOUT': 'Yahoo Finance API超時時間',

quantdinger_vue/src/views/indicator-analysis/components/KlineChart.vue

@@ -1504,7 +1504,12 @@ registerOverlay({
           if (response.code === 1 && response.data && Array.isArray(response.data)) {
             formattedData = formatKlineData(response.data)
           } else {
-            throw new Error(response.msg || '获取K线数据失败')
+            // 特殊处理 Tiingo 订阅限制提示
+            let errMsg = response.msg || '获取K线数据失败'
+            if (response.hint === 'tiingo_subscription') {
+              errMsg = proxy.$t('dashboard.indicator.error.tiingoSubscription') || 'Forex 1-minute data requires Tiingo paid subscription'
+            }
+            throw new Error(errMsg)
           }
         } catch (apiErr) {
           throw apiErr