feat(prices): add depeg monitoring for LRTs and stablecoins

[spalen0]

Summary

• Add centralized prices/ module for depeg monitoring of LRTs and stablecoins
• Use Redstone fundamental push oracles (LBTC, cUSD) where available — any depeg is CRITICAL
• Fall back to DefiLlama market pricing for weETH, ezETH, rsETH, pufETH, osETH, rswETH, mETH and stablecoins (FDUSD, deUSD, USD0, USD0++, USDe) — 2%+ depeg is CRITICAL
• Route all LRT alerts to single lrt protocol channel with token symbol identification
• Document Tenderly alert coverage and oracle research findings in README

Oracle Research Findings

Asset	Oracle	Tenderly
LBTC	Redstone push 0xb415...bc81	✅ Covered
cUSD	Redstone push 0x9a5a...434a	✅ Covered
weETH, ezETH, rsETH, pufETH	Redstone off-chain only (pull model)	Needs alert if push oracle deployed
osETH, rswETH, mETH	No fundamental feed	N/A — DefiLlama only

Closes #196

Test plan

• Verify oracle reads return valid data for LBTC and cUSD
• Verify DefiLlama prices are fetched and ratios computed correctly
• Verify alerts fire when thresholds are breached
• Add prices/main.py to appropriate GitHub Actions workflow
• Configure TELEGRAM_BOT_TOKEN_LRT / TELEGRAM_CHAT_ID_LRT and TELEGRAM_BOT_TOKEN_STABLES / TELEGRAM_CHAT_ID_STABLES secrets

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