Feature portfolio with balance

[gkoch78]

example of interaction: do I have enough sepolia WETH to buy 1000000 USDC

response:

Response: No, you don't have enough Sepolia WETH to buy 1,000,000 USDC. Here's why:
- Your current balance: 0.0765 WETH
- WETH needed: 17.9010 WETH
- Based on current prices (1 WETH ≈ 55862.92 USDC), you would need approximately 17.9010 WETH to buy 1,000,000 USDC.

[aflament]

export Portfolio

[aflament]

@Winston-503 to be migrated