[FEATURE] Decide "currency" value based on suffix country vaule in Yahoo Finance

I see many stock data in Vietnam did not show in the Asset lookup, it's because Yahoo did not have "**currency**" in the search response.

Example of stock "FPT"
```{
"exchange": "VSE",
"shortname": "FPT CORPORATION",
"quoteType": "EQUITY",
"symbol": "FPT.VN",
"index": "quotes",
"score": 20003,
"typeDisp": "Equity",
"longname": "FPT Corporation",
"exchDisp": "VSE",
"sector": "Technology",
"sectorDisp": "Technology",
"industry": "Information Technology Services",
"industryDisp": "Information Technology Services",
"dispSecIndFlag": false,
"isYahooFinance": true
}
```

I think we can achieve it by decide currency value by look at the suffix of symbol, which could be country code (VN - Vietnam in example above).

pseudo-code that update currency base on country code in **yahoo-finance.service.ts - search()**:
```js // force support Vietnamese stock
items.forEach((item) => {
if (item.symbol?.endsWith('.VN')) {
item.currency = 'VND';
}
});
```

I think if we have an option to let user decide what stock they want to display in the lookup would be nice