Fix token lookup keying: preserve enum keys in dynamic EVM token merge

[Copilot]

The mergeWithStaticConfig function was keying merged tokens by normalized symbol ("USDC.AXL") instead of preserving static config enum keys (EvmToken.AXLUSDC), breaking enum-based lookups throughout the codebase.

Changes

• dynamicEvmTokens.ts: Iterate over Object.entries() instead of Object.values() to preserve enum keys from static config
• Dual-keying strategy: Store tokens under both enum key (e.g., "AXLUSDC") and normalized symbol (e.g., "USDC.AXL") as aliases to the same object
• helpers.ts: Remove AXLUSDC special case in getOnChainTokenDetailsOrDefault - no longer needed with proper keying

Example

// Before: enum lookup fails, returns undefined
const token = getOnChainTokenDetails(Networks.Polygon, EvmToken.AXLUSDC);
// undefined (token was keyed as "USDC.AXL")

// After: both enum and symbol lookups work
const token1 = getOnChainTokenDetails(Networks.Polygon, EvmToken.AXLUSDC);    // ✓
const token2 = getOnChainTokenDetails(Networks.Polygon, "USDC.AXL");         // ✓
console.log(token1 === token2);  // true (same object reference)

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