test(trader): add comprehensive unit tests and CI coverage reporting (#823)

* chore(config): add Python and uv support to project

- Add comprehensive Python .gitignore rules (pycache, venv, pytest, etc.)
- Add uv package manager specific ignores (.uv/, uv.lock)
- Initialize pyproject.toml for Python tooling

Co-authored-by: Claude <noreply@anthropic.com>

* chore(deps): add testing dependencies

- Add github.com/stretchr/testify v1.11.1 for test assertions
- Add github.com/agiledragon/gomonkey/v2 v2.13.0 for mocking
- Promote github.com/rs/zerolog to direct dependency

Co-authored-by: Claude <noreply@anthropic.com>

* ci(workflow): add PR test coverage reporting

Add GitHub Actions workflow to run unit tests and report coverage on PRs:
- Run Go tests with race detection and coverage profiling
- Calculate coverage statistics and generate detailed reports
- Post coverage results as PR comments with visual indicators
- Fix Go version to 1.23 (was incorrectly set to 1.25.0)

Coverage guidelines:
- Green (>=80%): excellent
- Yellow (>=60%): good
- Orange (>=40%): fair
- Red (<40%): needs improvement

This workflow is advisory only and does not block PR merging.

Co-authored-by: Claude <noreply@anthropic.com>

* test(trader): add comprehensive unit tests for trader modules

Add unit test suites for multiple trader implementations:
- aster_trader_test.go: AsterTrader functionality tests
- auto_trader_test.go: AutoTrader lifecycle and operations tests
- binance_futures_test.go: Binance futures trader tests
- hyperliquid_trader_test.go: Hyperliquid trader tests
- trader_test_suite.go: Common test suite utilities and helpers

Also fix minor formatting issue in auto_trader.go (trailing whitespace)

Co-authored-by: Claude <noreply@anthropic.com>

* test(trader): preserve existing calculatePnLPercentage unit tests

Merge existing calculatePnLPercentage tests with incoming comprehensive test suite:
- Preserve TestCalculatePnLPercentage with 9 test cases covering edge cases
- Preserve TestCalculatePnLPercentage_RealWorldScenarios with 3 trading scenarios
- Add math package import for floating-point precision comparison
- All tests validate PnL percentage calculation with different leverage scenarios

Co-authored-by: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

trader/auto_trader.go

@@ -241,7 +241,7 @@ func (at *AutoTrader) Run() error {
 	at.isRunning = true
 	at.stopMonitorCh = make(chan struct{})
 	at.startTime = time.Now()
-	
+
 	log.Println("🚀 AI驱动自动交易系统启动")
 	log.Printf("💰 初始余额: %.2f USDT", at.initialBalance)
 	log.Printf("⚙️  扫描间隔: %v", at.config.ScanInterval)