ZhouYongyou 1abd7029dd refactor(decision): relax minimum position size constraints for flexibility ...

## Changes

### Prompt Layer (Soft Guidance)
**Before**:
- BTC/ETH ≥100 USDT | 山寨币 ≥15 USDT (硬性要求)

**After**:
- 统一建议 ≥12 USDT (软性建议)
- 更简洁，不区分币种
- 给 AI 更多决策空间

### Validation Layer (Lower Thresholds)
**Before**:
- BTC/ETH: 100 USDT (硬性)
- 山寨币: 15 USDT (硬性)

**After**:
- BTC/ETH: 60 USDT (-40%, 更灵活)
- 山寨币: 12 USDT (-20%, 更合理)

## Rationale

### Why Relax?

1. **Previous was too strict**:
   - 100 USDT for BTC hardcoded at current price (~101k)
   - If BTC drops to 60k, only needs 60 USDT
   - 15 USDT for altcoins = 50% safety margin (too conservative)

2. **Three-layer defense is sufficient**:
   - Layer 1 (Prompt): Soft suggestion (≥12 USDT)
   - Layer 2 (Validation): Medium threshold (BTC 60 / Alt 12)
   - Layer 3 (API): Final check (quantity != 0 + CheckMinNotional)

3. **User feedback**: Original constraints too restrictive

### Safety Preserved

✅ API layer still prevents:
- quantity = 0 errors (formatted precision check)
- Below min notional (CheckMinNotional)

✅ Validation still blocks obviously small amounts

✅ Prompt guides AI toward safe amounts

## Testing

| Symbol | Amount | Old | New | Result |
|--------|--------|-----|-----|--------|
| BTCUSDT | 50 USDT | ❌ Rejected | ❌ Rejected | ✅ Correct (too small) |
| BTCUSDT | 70 USDT | ❌ Rejected | ✅ Pass | ✅ More flexible |
| ADAUSDT | 11 USDT | ❌ Rejected | ❌ Rejected | ✅ Correct (too small) |
| ADAUSDT | 13 USDT | ❌ Rejected | ✅ Pass | ✅ More flexible |

## Impact

- ✅ More flexible for price fluctuations
- ✅ Better user experience for small accounts
- ✅ Still prevents API errors
- ✅ AI has more decision space

2025-11-05 01:18:22 +08:00

..

engine.go

refactor(decision): relax minimum position size constraints for flexibility

2025-11-05 01:18:22 +08:00

prompt_manager.go

Supports custom system prompts and custom models.

2025-11-01 19:45:54 +08:00