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/scoring/weights.go

@@ -0,0 +1,25 @@
+package scoring
+
+// ScoreWeights 评分权重配置
+type ScoreWeights struct {
+	// LatencyWeight 延迟权重 (40%)
+	LatencyWeight float64
+	// AvailabilityWeight 可用性权重 (30%)
+	AvailabilityWeight float64
+	// CostWeight 成本权重 (20%)
+	CostWeight float64
+	// QualityWeight 质量权重 (10%)
+	QualityWeight float64
+}
+
+// DefaultWeights 默认权重配置
+// LatencyWeight = 0.4 (40%)
+// AvailabilityWeight = 0.3 (30%)
+// CostWeight = 0.2 (20%)
+// QualityWeight = 0.1 (10%)
+var DefaultWeights = ScoreWeights{
+	LatencyWeight:      0.4,
+	AvailabilityWeight: 0.3,
+	CostWeight:          0.2,
+	QualityWeight:       0.1,
+}