feat(P1/P2): 完成TDD开发及P1/P2设计文档

## 设计文档
- multi_role_permission_design: 多角色权限设计 (CONDITIONAL GO)
- audit_log_enhancement_design: 审计日志增强 (CONDITIONAL GO)
- routing_strategy_template_design: 路由策略模板 (CONDITIONAL GO)
- sso_saml_technical_research: SSO/SAML调研 (CONDITIONAL GO)
- compliance_capability_package_design: 合规能力包设计 (CONDITIONAL GO)

## TDD开发成果
- IAM模块: supply-api/internal/iam/ (111个测试)
- 审计日志模块: supply-api/internal/audit/ (40+测试)
- 路由策略模块: gateway/internal/router/ (33+测试)
- 合规能力包: gateway/internal/compliance/ + scripts/ci/compliance/

## 规范文档
- parallel_agent_output_quality_standards: 并行Agent产出质量规范
- project_experience_summary: 项目经验总结 (v2)
- 2026-04-02-p1-p2-tdd-execution-plan: TDD执行计划

## 评审报告
- 5个CONDITIONAL GO设计文档评审报告
- fix_verification_report: 修复验证报告
- full_verification_report: 全面质量验证报告
- tdd_module_quality_verification: TDD模块质量验证
- tdd_execution_summary: TDD执行总结

依据: Superpowers执行框架 + TDD规范

gateway/internal/router/strategy/ab_strategy_test.go

@@ -0,0 +1,161 @@
+package strategy
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// TestABStrategy_TrafficSplit 测试A/B测试流量分配
+func TestABStrategy_TrafficSplit(t *testing.T) {
+	ab := &ABStrategy{
+		controlStrategy:    &RoutingStrategyTemplate{ID: "control"},
+		experimentStrategy: &RoutingStrategyTemplate{ID: "experiment"},
+		trafficSplit:       20, // 20%实验组
+		bucketKey:          "user_id",
+	}
+
+	// 验证流量分配
+	// 一致性哈希：同一user_id始终分配到同一组
+	controlCount := 0
+	experimentCount := 0
+
+	for i := 0; i < 100; i++ {
+		userID := string(rune('0' + i))
+		isExperiment := ab.ShouldApplyToRequest(&RoutingRequest{UserID: userID})
+
+		if isExperiment {
+			experimentCount++
+		} else {
+			controlCount++
+		}
+	}
+
+	// 验证一致性：同一user_id应该始终在同一组
+	for i := 0; i < 10; i++ {
+		userID := "test_user_123"
+		first := ab.ShouldApplyToRequest(&RoutingRequest{UserID: userID})
+		for j := 0; j < 10; j++ {
+			second := ab.ShouldApplyToRequest(&RoutingRequest{UserID: userID})
+			assert.Equal(t, first, second, "Same user_id should always be in same group")
+		}
+	}
+
+	// 验证分配比例大约是80:20
+	assert.InDelta(t, 80, controlCount, 15, "Control should be around 80%%")
+	assert.InDelta(t, 20, experimentCount, 15, "Experiment should be around 20%%")
+}
+
+// TestRollout_Percentage 测试灰度发布百分比递增
+func TestRollout_Percentage(t *testing.T) {
+	rollout := &RolloutStrategy{
+		percentage: 10,
+		bucketKey: "user_id",
+	}
+
+	// 统计10%时的用户数
+	count10 := 0
+	for i := 0; i < 100; i++ {
+		userID := string(rune('0' + i))
+		if rollout.ShouldApply(&RoutingRequest{UserID: userID}) {
+			count10++
+		}
+	}
+	assert.InDelta(t, 10, count10, 5, "10%% rollout should have around 10 users")
+
+	// 增加百分比到20%
+	rollout.SetPercentage(20)
+
+	// 统计20%时的用户数
+	count20 := 0
+	for i := 0; i < 100; i++ {
+		userID := string(rune('0' + i))
+		if rollout.ShouldApply(&RoutingRequest{UserID: userID}) {
+			count20++
+		}
+	}
+	assert.InDelta(t, 20, count20, 5, "20%% rollout should have around 20 users")
+
+	// 增加百分比到50%
+	rollout.SetPercentage(50)
+
+	// 统计50%时的用户数
+	count50 := 0
+	for i := 0; i < 100; i++ {
+		userID := string(rune('0' + i))
+		if rollout.ShouldApply(&RoutingRequest{UserID: userID}) {
+			count50++
+		}
+	}
+	assert.InDelta(t, 50, count50, 10, "50%% rollout should have around 50 users")
+
+	// 增加百分比到100%
+	rollout.SetPercentage(100)
+
+	// 验证100%时所有用户都在
+	for i := 0; i < 100; i++ {
+		userID := string(rune('0' + i))
+		assert.True(t, rollout.ShouldApply(&RoutingRequest{UserID: userID}), "All users should be in 100% rollout")
+	}
+}
+
+// TestRollout_Consistency 测试灰度发布一致性
+func TestRollout_Consistency(t *testing.T) {
+	rollout := &RolloutStrategy{
+		percentage: 30,
+		bucketKey: "user_id",
+	}
+
+	// 同一用户应该始终被同样对待
+	userID := "consistent_user"
+	firstResult := rollout.ShouldApply(&RoutingRequest{UserID: userID})
+
+	for i := 0; i < 100; i++ {
+		result := rollout.ShouldApply(&RoutingRequest{UserID: userID})
+		assert.Equal(t, firstResult, result, "Same user should always have same result")
+	}
+}
+
+// TestRollout_PercentageIncrease 测试百分比递增
+func TestRollout_PercentageIncrease(t *testing.T) {
+	rollout := &RolloutStrategy{
+		percentage: 10,
+		bucketKey: "user_id",
+	}
+
+	// 收集10%时的用户
+	var in10Percent []string
+	for i := 0; i < 100; i++ {
+		userID := string(rune('a' + i))
+		if rollout.ShouldApply(&RoutingRequest{UserID: userID}) {
+			in10Percent = append(in10Percent, userID)
+		}
+	}
+
+	// 增加百分比到50%
+	rollout.SetPercentage(50)
+
+	// 收集50%时的用户
+	var in50Percent []string
+	for i := 0; i < 100; i++ {
+		userID := string(rune('a' + i))
+		if rollout.ShouldApply(&RoutingRequest{UserID: userID}) {
+			in50Percent = append(in50Percent, userID)
+		}
+	}
+
+	// 50%的用户应该包含10%的用户（一致性）
+	for _, userID := range in10Percent {
+		found := false
+		for _, id := range in50Percent {
+			if userID == id {
+				found = true
+				break
+			}
+		}
+		assert.True(t, found, "10%% users should be included in 50%% rollout")
+	}
+
+	// 50%应该包含更多用户
+	assert.Greater(t, len(in50Percent), len(in10Percent), "50%% should have more users than 10%%")
+}