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/pkg/uniswap/optimized_cached.go

@@ -0,0 +1,28 @@
+// Package uniswap provides mathematical functions for Uniswap V3 calculations.
+package uniswap
+
+import "math/big"
+
+// SqrtPriceX96ToPriceOptimizedCached provides the same functionality as SqrtPriceX96ToPriceAdvanced
+// This alias is maintained for API compatibility with existing code that might reference this function
+func SqrtPriceX96ToPriceOptimizedCached(sqrtPriceX96 *big.Int) *big.Float {
+	return SqrtPriceX96ToPriceAdvanced(sqrtPriceX96)
+}
+
+// PriceToSqrtPriceX96OptimizedCached provides the same functionality as PriceToSqrtPriceX96Advanced
+// This alias is maintained for API compatibility with existing code that might reference this function
+func PriceToSqrtPriceX96OptimizedCached(price *big.Float) *big.Int {
+	return PriceToSqrtPriceX96Advanced(price)
+}
+
+// TickToSqrtPriceX96OptimizedCached provides the same functionality as TickToSqrtPriceX96Advanced
+// This alias is maintained for API compatibility with existing code that might reference this function
+func TickToSqrtPriceX96OptimizedCached(tick int) *big.Int {
+	return TickToSqrtPriceX96Advanced(tick)
+}
+
+// SqrtPriceX96ToTickOptimizedCached provides the same functionality as SqrtPriceX96ToTickAdvanced
+// This alias is maintained for API compatibility with existing code that might reference this function
+func SqrtPriceX96ToTickOptimizedCached(sqrtPriceX96 *big.Int) int {
+	return SqrtPriceX96ToTickAdvanced(sqrtPriceX96)
+}