Trader: add comprehensive loss detection logging

[konard]

Summary

This PR implements comprehensive loss detection logging for the trader bot as requested in issue #200. The enhanced logging allows careful investigation of reasons for losses by tracking all scenarios where trades might result in losses.

Changes Made

1. Enhanced Loss Detection in Core Methods

• GetMinimumSellPrice(): Added warnings when MinimumProfitSteps < 0 indicating loss selling is allowed
• Main sell order placement: Added profit/loss logging when placing initial sell orders
• Early sell logic: Added loss detection when selling at top bid price results in losses
• Price change logic: Added loss detection when sell order prices are adjusted downward

2. Realized Profit/Loss Tracking

• UpdateCashBalance(): Enhanced to track actual realized profits/losses when sell orders execute
• Source price tracking: Utilizes ActiveSellOrderSourcePrice to compare execution price vs original buy price

3. Comprehensive Logging Strategy

• Loss scenarios: Logged at LogWarning level for easy detection and filtering
• Profit scenarios: Logged at LogInformation level for comparison
• Detailed information: Each log includes source price, target price, actual amount, and lot quantity

Loss Detection Points

1. Potential losses - When orders are configured to allow losses (MinimumProfitSteps < 0)
2. Planned losses - When sell orders are placed below purchase price
3. Early sell losses - When market conditions force selling at top bid price for losses
4. Price adjustment losses - When sell order prices are changed and result in losses
5. Realized losses - When sell trades actually execute at a loss

Configuration Context

The bot is currently configured to allow losses:

• TMON: MinimumProfitSteps: -1 (allows 1 price step loss)
• TRUR: MinimumProfitSteps: -2 (allows 2 price step loss)

Example Log Output

WARN: Loss detection: selling at loss allowed. Source price: 100.50, minimum sell price: 100.25, potential loss: 0.25 (-1 price steps)
WARN: Loss detection: placing sell order at LOSS. Source price: 100.50, target sell price: 100.25, actual loss: 0.25, lots: 10
WARN: Loss realized: SELL EXECUTED at LOSS. Source price: 100.50, execution price: 100.25, lots: 10, realized loss: 2.50, total revenue: 1002.50

Testing

• Code compiles successfully with no errors
• All new logging follows existing patterns and conventions
• Uses proper log levels (Warning for losses, Information for profits)

Fixes #200

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