feat: add daily APY snapshot bot for X and Farcaster

[samsonmbah002]

Summary

Adds a daily snapshot bot (scripts/daily_post.ts) that:

• Fetches live APY rates for all pools/assets on Etherfuse and Fixed pools
• Computes net APY at standard leverage brackets (2x, 3x, 5x, 8x, 10x)
• Formats and posts a readable snapshot to X (Twitter) and Farcaster
• Logs failures gracefully without crashing
• Stores credentials securely via environment variables

Related Issue

Closes #92

Checks

• Script follows existing patterns in scripts/ directory
• Uses existing Stellar SDK dependency for on-chain data
• Env-based credential storage (no secrets in code)
• Failure to post logs error but does not crash the process

Notes

Run with: npx tsx scripts/daily_post.ts

Required env vars:

• X_API_KEY, X_API_SECRET, X_ACCESS_TOKEN, X_ACCESS_SECRET — Twitter API v2 credentials
• NEYNAR_API_KEY, NEYNAR_SIGNER_UUID — Neynar Farcaster API credentials

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