Improve global market dashboard UX and settings

- Add global market dashboard APIs/assets and improve data robustness (incl. crypto heatmap by market cap)

- Enhance global market UI (map+heatmap layout, loading behavior, formatting, theme tweaks)

- Fix Settings LLM Provider select to render label/value options correctly

- Rename Indicator Community to Official Community and move it to the bottom

- Add search fallback when Google quota is exhausted

quantdinger_vue/src/api/global-market.js

@@ -0,0 +1,79 @@
+/**
+ * Global Market Dashboard API
+ */
+import request from '@/utils/request'
+
+const BASE_URL = '/api/global-market'
+
+/**
+ * Get global market overview (indices, forex, crypto, commodities)
+ * Includes geo coordinates for world map display
+ */
+export function getMarketOverview () {
+  return request({
+    url: `${BASE_URL}/overview`,
+    method: 'get'
+  })
+}
+
+/**
+ * Get market heatmap data (crypto, stock sectors, forex)
+ */
+export function getMarketHeatmap () {
+  return request({
+    url: `${BASE_URL}/heatmap`,
+    method: 'get'
+  })
+}
+
+/**
+ * Get financial news - separated by language (cn/en)
+ * @param {string} lang - Language filter: 'cn', 'en', or 'all' (default)
+ */
+export function getMarketNews (lang = 'all') {
+  return request({
+    url: `${BASE_URL}/news`,
+    method: 'get',
+    params: { lang }
+  })
+}
+
+/**
+ * Get economic calendar with impact indicators
+ */
+export function getEconomicCalendar () {
+  return request({
+    url: `${BASE_URL}/calendar`,
+    method: 'get'
+  })
+}
+
+/**
+ * Get market sentiment (Fear & Greed Index, VIX)
+ */
+export function getMarketSentiment () {
+  return request({
+    url: `${BASE_URL}/sentiment`,
+    method: 'get'
+  })
+}
+
+/**
+ * Get trading opportunities based on technical analysis
+ */
+export function getTradingOpportunities () {
+  return request({
+    url: `${BASE_URL}/opportunities`,
+    method: 'get'
+  })
+}
+
+/**
+ * Force refresh all market data (clears cache)
+ */
+export function refreshMarketData () {
+  return request({
+    url: `${BASE_URL}/refresh`,
+    method: 'post'
+  })
+}