Fix Rates getTicker endpoint - resolve 404 error

The Strike API /rates/ticker endpoint returns all currency pairs in a single response, not individual pairs. Updated the implementation to:

- Remove incorrect currency pair parameter from endpoint URL
- Fetch all tickers and filter to requested pair client-side
- Add "All Currency Pairs" option to get all rates at once
- Add BTC/AUD and BTC/USDT currency pair options
- Improve error handling when requested pair not found

Fixes 404 "Resource not found" error when using Rates > Get Ticker operation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

nodes/Strike/Strike.node.ts

@@ -503,7 +503,27 @@ export class Strike implements INodeType {
 				if (resource === 'rates') {
 					if (operation === 'getTicker') {
 						const currencyPair = this.getNodeParameter('currencyPair', i) as string;
-						responseData = await strikeApiRequest.call(this, 'GET', `/rates/ticker/${currencyPair}`);
+						// The Strike API returns all currency pairs
+						const allTickers = await strikeApiRequest.call(this, 'GET', '/rates/ticker');
+
+						// Filter to the requested currency pair
+						if (currencyPair && currencyPair !== 'all') {
+							// Extract source and target currencies (e.g., 'BTCUSD' -> 'BTC' and 'USD')
+							const sourceCurrency = currencyPair.slice(0, 3);
+							const targetCurrency = currencyPair.slice(3);
+
+							responseData = allTickers.find((ticker: any) =>
+								ticker.sourceCurrency === sourceCurrency &&
+								ticker.targetCurrency === targetCurrency
+							);
+
+							if (!responseData) {
+								responseData = { error: `Currency pair ${currencyPair} not found in available tickers` };
+							}
+						} else {
+							// Return all tickers if 'all' is selected
+							responseData = allTickers;
+						}
 					}
 				}