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/strategy_test.go

@@ -0,0 +1,65 @@
+package strategy
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"lijiaoqiao/gateway/internal/adapter"
+)
+
+// TestStrategyTemplate_Interface 验证策略模板接口
+func TestStrategyTemplate_Interface(t *testing.T) {
+	// 所有策略实现必须实现SelectProvider, Name, Type方法
+
+	// 创建策略实现示例
+	costBased := &CostBasedTemplate{
+		name: "CostBased",
+	}
+
+	aware := &CostAwareTemplate{
+		name: "CostAware",
+	}
+
+	// 验证实现了StrategyTemplate接口
+	var _ StrategyTemplate = costBased
+	var _ StrategyTemplate = aware
+
+	// 验证方法
+	assert.Equal(t, "CostBased", costBased.Name())
+	assert.Equal(t, "cost_based", costBased.Type())
+
+	assert.Equal(t, "CostAware", aware.Name())
+	assert.Equal(t, "cost_aware", aware.Type())
+}
+
+// TestStrategyTemplate_SelectProvider_Signature 验证SelectProvider方法签名
+func TestStrategyTemplate_SelectProvider_Signature(t *testing.T) {
+	req := &RoutingRequest{
+		Model:      "gpt-4",
+		UserID:     "user123",
+		TenantID:  "tenant1",
+		MaxCost:   1.0,
+		MaxLatency: 1000,
+	}
+
+	// 验证返回值 - 创建一个有providers的模板
+	template := &CostBasedTemplate{
+		name:               "test",
+		maxCostPer1KTokens: 1.0,
+		providers:          make(map[string]adapter.ProviderAdapter),
+	}
+	template.providers["test"] = &MockProvider{
+		name:            "test",
+		costPer1KTokens: 0.5,
+		available:       true,
+		models:          []string{"gpt-4"},
+	}
+
+	decision, err := template.SelectProvider(context.Background(), req)
+
+	// 接口实现应该返回决策或错误
+	assert.NotNil(t, decision)
+	assert.Nil(t, err)
+}