Add production-ready one-command miner installer with virtualenv isolation and service management

[Copilot]

Implements a comprehensive installer for RustChain miners supporting Linux (Ubuntu/Debian/Fedora) and macOS (Intel/Apple Silicon) with virtualenv isolation, persistent service setup, and clean uninstall.

Changes

Installer enhancements (install.sh)

• Virtualenv isolation at ~/.rustchain/venv - dependencies install without touching system Python
• Systemd user service (Linux) and launchd agent (macOS) for auto-start on boot with failure restart
• --uninstall flag removes services, files, virtualenv, and configuration cleanly
• --wallet WALLET_NAME argument for non-interactive installations
• Post-install output includes wallet balance check commands and service management instructions

Platform support

• Linux: x86_64, ppc64le, ppc, POWER8 with systemd service
• macOS: Intel (x86_64), Apple Silicon (arm64), PowerPC with launchd agent

Documentation

• Updated README.md with installation examples and service management commands
• New INSTALL.md (371 lines) covering installation, troubleshooting, service management, and security notes

Usage

# Install with auto-generated wallet
curl -sSL https://raw.githubusercontent.com/Scottcjn/Rustchain/main/install.sh | bash

# Install with specific wallet (non-interactive)
curl -sSL https://raw.githubusercontent.com/Scottcjn/Rustchain/main/install.sh | bash -s -- --wallet my-miner

# Uninstall completely
curl -sSL https://raw.githubusercontent.com/Scottcjn/Rustchain/main/install.sh | bash -s -- --uninstall

# Manage service (Linux)
systemctl --user status rustchain-miner

# Manage service (macOS)
launchctl list | grep rustchain

Technical notes

• Virtualenv creation uses python -m venv with fallback to virtualenv module
• Services run as user (no root/sudo required)
• SSL verification disabled for self-signed node certificate (documented in security notes)
• Service logs to ~/.rustchain/miner.log

Original prompt

Fetch this issue and all it's comment and implement the features ( https://github.com/Scottcjn/ rustchain-bounties/ issues/4) I spaced the link out so the issue does not get tagged , don't tag the issue in the final pr, implement all features requested in the issue

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.