Add production-ready FCT auto-miner

[RogerPodacter]

Summary

• Adds a production-ready auto-mining system with intelligent strategies
• Replaces SQLite with JSON for zero native dependencies
• Fixes critical FCT calculation bug (SDK's calculateInputGasCost was wrong)

How to Try It

Quick Start

# Install dependencies
pnpm install

# Basic auto-mining with cost limit and budget
pnpm auto --max-cost 0.0005 --budget 0.01

# Mine during off-peak hours (2-6 AM)
pnpm auto -H 2-6 --budget 0.02

# Arbitrage mode - only mine when cheaper than DEX
pnpm auto --strategy arbitrage

# View analytics and performance
pnpm auto:analyze

Key Features

• Smart Mining: Automatically mines when conditions are favorable
• Budget Control: Set daily ETH budgets to limit exposure
• Cost Optimization: Focus on cost/FCT (the only metric that matters)
• Schedule Mining: Mine during specific hours
• Crash Recovery: Persists state to JSON, resumes after restarts
• Real Analytics: Track efficiency, best hours, ROI

Available Commands

pnpm auto              # Start auto-miner with default settings
pnpm auto:profiles     # View example configurations
pnpm auto:analyze      # View mining statistics

Configuration Options

• --max-cost <usd> - Maximum cost per FCT in USD (e.g., 0.0005)
• --budget <eth> - Daily budget in ETH (e.g., 0.01)
• -H, --hours <range> - Hours to mine (e.g., '2-6,14-18')
• --strategy <type> - Mining strategy: auto or arbitrage
• --target <fct> - Stop after mining this much FCT
• --min-efficiency <percent> - Minimum mining efficiency

Important Fix

This PR fixes a critical bug where we were using the SDK's calculateInputGasCost which underestimates gas by ~60%. Now using the correct formula: non_zero_bytes * 40 + zero_bytes * 10 gas.

Test Plan

• Tested auto-mining on mainnet
• Verified cost calculations match actual L1 receipts
• Tested crash recovery and session persistence
• Verified budget limits work correctly
• Tested schedule-based mining