refactor: move all remaining files to orig/ directory

Completed clean root directory structure:
- Root now contains only: .git, .env, docs/, orig/
- Moved all remaining files and directories to orig/:
  - Config files (.claude, .dockerignore, .drone.yml, etc.)
  - All .env variants (except active .env)
  - Git config (.gitconfig, .github, .gitignore, etc.)
  - Tool configs (.golangci.yml, .revive.toml, etc.)
  - Documentation (*.md files, @prompts)
  - Build files (Dockerfiles, Makefile, go.mod, go.sum)
  - Docker compose files
  - All source directories (scripts, tests, tools, etc.)
  - Runtime directories (logs, monitoring, reports)
  - Dependency files (node_modules, lib, cache)
  - Special files (--delete)

- Removed empty runtime directories (bin/, data/)

V2 structure is now clean:
- docs/planning/ - V2 planning documents
- orig/ - Complete V1 codebase preserved
- .env - Active environment config (not in git)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.env.example

@@ -1,115 +0,0 @@
-# MEV Bot Environment Configuration Template
-# Copy this file to .env and fill in your actual values
-# SECURITY WARNING: Never commit .env files with actual credentials to version control
-
-# ============================================================
-# ARBITRUM NETWORK CONFIGURATION
-# ============================================================
-# HTTP endpoint for transaction execution (reliable)
-# Get your own endpoint from: https://chainstack.com or https://alchemy.com
-ARBITRUM_RPC_ENDPOINT=https://arbitrum-mainnet.infura.io/v3/YOUR_PROJECT_ID
-
-# WebSocket endpoint for real-time event monitoring
-ARBITRUM_WS_ENDPOINT=wss://arbitrum-mainnet.infura.io/ws/v3/YOUR_PROJECT_ID
-
-# ============================================================
-# RPC RATE LIMITING
-# ============================================================
-# Requests per second to avoid provider rate limits
-# Adjust based on your provider's tier (free tier: 1-2, paid: 10-50)
-RPC_REQUESTS_PER_SECOND=2
-
-# Maximum concurrent RPC connections
-# Lower values reduce rate limit errors but slow down processing
-RPC_MAX_CONCURRENT=1
-
-# ============================================================
-# BOT PERFORMANCE CONFIGURATION
-# ============================================================
-# Number of worker goroutines for opportunity processing
-BOT_MAX_WORKERS=3
-
-# Buffer size for opportunity channel
-BOT_CHANNEL_BUFFER_SIZE=100
-
-# ============================================================
-# ETHEREUM ACCOUNT CONFIGURATION
-# ============================================================
-# CRITICAL: Replace with your actual private key (without 0x prefix)
-# Generate with: cast wallet new (foundry) or eth-keygen
-ETHEREUM_PRIVATE_KEY=0000000000000000000000000000000000000000000000000000000000000000
-
-# Your Ethereum account address (checksum format)
-ETHEREUM_ACCOUNT_ADDRESS=0x0000000000000000000000000000000000000000
-
-# Gas price multiplier for competitive transaction submission (1.0 = no increase)
-ETHEREUM_GAS_PRICE_MULTIPLIER=1.2
-
-# ============================================================
-# CONTRACT ADDRESSES
-# ============================================================
-# Deploy these contracts first, then update addresses here
-# See: docs/deployment/contract-deployment.md
-CONTRACT_ARBITRAGE_EXECUTOR=0x0000000000000000000000000000000000000000
-CONTRACT_FLASH_SWAPPER=0x0000000000000000000000000000000000000000
-
-# ============================================================
-# SECURITY CONFIGURATION
-# ============================================================
-# Encryption key for keystore (MUST be 32+ characters)
-# Generate with: openssl rand -base64 32
-# CRITICAL: Keep this secret! Losing it means losing access to keys
-MEV_BOT_ENCRYPTION_KEY=REPLACE_WITH_32_CHARACTER_MINIMUM_RANDOM_STRING_FROM_OPENSSL
-
-# Keystore directory for encrypted private keys
-MEV_BOT_KEYSTORE_PATH=keystore
-
-# Audit log path for security events
-MEV_BOT_AUDIT_LOG=logs/audit.log
-
-# Backup directory for key backups
-MEV_BOT_BACKUP_PATH=backups
-
-# ============================================================
-# LOGGING AND MONITORING
-# ============================================================
-# Log level: debug, info, warn, error
-LOG_LEVEL=info
-
-# Log format: text, json
-LOG_FORMAT=text
-
-# Enable Prometheus metrics endpoint
-METRICS_ENABLED=true
-
-# Metrics server port
-METRICS_PORT=9090
-
-# ============================================================
-# ENVIRONMENT MODE
-# ============================================================
-# Environment: development, staging, production
-# Controls which config file is loaded (config/local.yaml, config/staging.yaml, config/arbitrum_production.yaml)
-GO_ENV=development
-
-# Debug mode (verbose logging)
-DEBUG=false
-
-# ============================================================
-# BLOCKCHAIN EXPLORER API KEYS (OPTIONAL)
-# ============================================================
-# Arbiscan API key for contract verification and transaction tracking
-# Get free key from: https://arbiscan.io/apis
-ARBISCAN_API_KEY=YOUR_ARBISCAN_API_KEY_HERE
-
-# ============================================================
-# ADVANCED CONFIGURATION (OPTIONAL)
-# ============================================================
-# Allow localhost RPC endpoints (security: only enable for development)
-MEV_BOT_ALLOW_LOCALHOST=false
-
-# Dashboard server port
-DASHBOARD_PORT=8080
-
-# Security webhook URL for alerts (Slack, Discord, etc.)
-SECURITY_WEBHOOK_URL=https://hooks.slack.com/services/YOUR/WEBHOOK/URL