feat: Add debug endpoints for wallet info and log level management

[mcamou]

Summary

This PR adds new debug endpoints for monitoring and managing the faucet service:

• /debug/wallets - View all worker wallets with balances and funding status
• /debug/loglevel - GET/PUT endpoints for runtime log level management

Changes

• New /debug/wallets endpoint: Returns JSON array with wallet addresses, balances, denominations, and funding status for all workers
• New /debug/loglevel endpoints:
  • GET returns current log level as JSON
  • PUT sets log level dynamically (supports debug, info, warn, error)
  • PUT without parameters resets to configured default
• WorkerManager: Created new manager component to centralize worker lifecycle and provide wallet information
• Refactored xlog.SetLevel(): Simplified API to take string parameter instead of slog.Level
• Organized debug routes: All debug endpoints now grouped under /debug for better structure

API Examples

# Get all wallet info
curl http://localhost:8080/debug/wallets

# Get current log level
curl http://localhost:8080/debug/loglevel

# Set log level to debug
curl -X PUT http://localhost:8080/debug/loglevel?level=debug

# Reset log level to default
curl -X PUT http://localhost:8080/debug/loglevel

Test plan

• All existing tests pass
• New tests added for wallet and log level endpoints
• Build succeeds without errors
• API responses follow expected JSON schema

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