feat: create v2-prep branch with comprehensive planning

Restructured project for V2 refactor:

**Structure Changes:**
- Moved all V1 code to orig/ folder (preserved with git mv)
- Created docs/planning/ directory
- Added orig/README_V1.md explaining V1 preservation

**Planning Documents:**
- 00_V2_MASTER_PLAN.md: Complete architecture overview
  - Executive summary of critical V1 issues
  - High-level component architecture diagrams
  - 5-phase implementation roadmap
  - Success metrics and risk mitigation

- 07_TASK_BREAKDOWN.md: Atomic task breakdown
  - 99+ hours of detailed tasks
  - Every task < 2 hours (atomic)
  - Clear dependencies and success criteria
  - Organized by implementation phase

**V2 Key Improvements:**
- Per-exchange parsers (factory pattern)
- Multi-layer strict validation
- Multi-index pool cache
- Background validation pipeline
- Comprehensive observability

**Critical Issues Addressed:**
- Zero address tokens (strict validation + cache enrichment)
- Parsing accuracy (protocol-specific parsers)
- No audit trail (background validation channel)
- Inefficient lookups (multi-index cache)
- Stats disconnection (event-driven metrics)

Next Steps:
1. Review planning documents
2. Begin Phase 1: Foundation (P1-001 through P1-010)
3. Implement parsers in Phase 2
4. Build cache system in Phase 3
5. Add validation pipeline in Phase 4
6. Migrate and test in Phase 5

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

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

orig/config/config.dev.yaml

@@ -0,0 +1,109 @@
+# MEV Bot Development Configuration
+
+# Arbitrum node configuration
+arbitrum:
+  # RPC endpoint for Arbitrum node (using public endpoint for development)
+  rpc_endpoint: "https://arb1.arbitrum.io/rpc"
+  # WebSocket endpoint for Arbitrum node - CRITICAL FIX: Use HTTP instead of WSS to avoid 403
+  # The Chainstack WSS endpoint in .env returns 403 Forbidden
+  # Using empty string will make bot use RPC endpoint for both HTTP and WS
+  ws_endpoint: ""
+  # Chain ID for Arbitrum (42161 for mainnet)
+  chain_id: 42161
+  # Rate limiting configuration for RPC endpoint
+  # CRITICAL FIX: Reduced limits to prevent 429 errors on public endpoints
+  rate_limit:
+    # Maximum requests per second (reduced from 5 to 2 for public endpoint)
+    requests_per_second: 2
+    # Maximum concurrent requests (reduced from 3 to 1)
+    max_concurrent: 1
+    # Burst size for rate limiting (reduced from 10 to 3)
+    burst: 3
+  # Fallback RPC endpoints - Multiple endpoints for redundancy
+  fallback_endpoints:
+    - url: "https://arbitrum-rpc.publicnode.com"
+      rate_limit:
+        requests_per_second: 1
+        max_concurrent: 1
+        burst: 2
+    - url: "https://1rpc.io/arb"
+      rate_limit:
+        requests_per_second: 1
+        max_concurrent: 1
+        burst: 2
+    - url: "https://arbitrum.llamarpc.com"
+      rate_limit:
+        requests_per_second: 1
+        max_concurrent: 1
+        burst: 2
+
+# Bot configuration
+bot:
+  # Enable or disable the bot
+  enabled: true
+  # Polling interval in seconds (reduced to lower RPC request rate)
+  polling_interval: 5
+  # Minimum profit threshold in USD
+  min_profit_threshold: 5.0
+  # Gas price multiplier (for faster transactions)
+  gas_price_multiplier: 1.2
+  # Maximum number of concurrent workers for processing (reduced from 5 to 3)
+  max_workers: 3
+  # Buffer size for channels
+  channel_buffer_size: 50
+  # Timeout for RPC calls in seconds (increased from 30 to 60 for better retry handling)
+  rpc_timeout: 60
+
+# Uniswap configuration
+uniswap:
+  # Factory contract address
+  factory_address: "0x1F98431c8aD98523631AE4a59f267346ea31F984"
+  # Position manager contract address
+  position_manager_address: "0xC36442b4a4522E871399CD717aBDD847Ab11FE88"
+  # Supported fee tiers
+  fee_tiers:
+    - 500    # 0.05%
+    - 3000   # 0.3%
+    - 10000  # 1%
+  # Cache configuration for pool data
+  cache:
+    # Enable or disable caching
+    enabled: true
+    # Cache expiration time in seconds (increased from 300 to 600 to reduce RPC calls)
+    expiration: 600
+    # Maximum cache size (increased from 1000 to 2000)
+    max_size: 2000
+
+# Logging configuration
+log:
+  # Log level (debug, info, warn, error)
+  level: "debug"
+  # Log format (json, text)
+  format: "text"
+  # Log file path (empty for stdout)
+  file: ""
+
+# Database configuration
+database:
+  # Database file path
+  file: "data/mev-bot.db"
+  # Maximum number of open connections
+  max_open_connections: 5
+  # Maximum number of idle connections
+  max_idle_connections: 2
+# Arbitrage configuration
+arbitrage:
+  # Enable or disable arbitrage service
+  enabled: true
+  # Minimum profit threshold in USD
+  min_profit: 1.0
+  # Maximum position size in USD
+  max_position_size: 1000.0
+  # Gas price limit in gwei
+  max_gas_price: 100
+  # Minimum swap size to trigger arbitrage detection (in wei)
+  min_significant_swap_size: 10000000000000000  # 0.01 ETH
+  # Minimum scan amount (in wei) - CRITICAL FIX for amount=0 bug
+  min_scan_amount_wei: 10000000000000000  # 0.01 ETH minimum
+  # Maximum scan amount (in wei) - fits in int64 (max 9.2e18)
+  max_scan_amount_wei: 9000000000000000000  # 9 ETH maximum (fits int64)