fix: add fallback when no feed data, add aliases

[Anniew31]

Fixes:

• /api/feed was returning empty tweets array which caused the bot to receive zero signals and never trade so I implemented a fallback using live movers so the bot would be able to trade
• /api/markets/arbitrage returned opportunities under data.opportunities but the bot read data.arbitrage_opportunities so I added alias
• Market objects exposed volume24h but the bot was reading volume so I added an alias for that in the market object

[vercel]

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