feat(config): add NSE and BSE (India) market support (#1102)

[lspassos1]

This PR adds regional market support for India.

Key changes:

• Created india-markets.ts with NSE and BSE configuration.
• Added support for tracking Indian equity indices and major tickers.

[vercel]

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[koala73]

Thanks @lspassos1! The India market config looks solid: correct Yahoo Finance ticker formats, good coverage of major NSE equities by market cap, and clean use of the MarketSymbol type.

One thing though: india-markets.ts is currently an orphan file. Nothing imports INDIA_MARKET_SYMBOLS, so this PR doesn't change any behavior yet.

Next steps to make this functional:

1. Wire INDIA_MARKET_SYMBOLS into src/config/markets.ts (or wherever regional market symbols are consumed)
2. Make sure the symbols flow through to the market data fetching pipeline so they actually appear in the UI
3. Verify the Yahoo Finance tickers resolve correctly (especially M&M.NS, the ampersand can sometimes cause issues in URL encoding)

Could you update this PR with the integration, or let us know if you'd like guidance on where to plug it in?