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/compliance/rules/cred_direct_test.go

@@ -0,0 +1,177 @@
+package rules
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// TestCredDirectSupplier 测试直连供应商检测
+func TestCredDirectSupplier(t *testing.T) {
+	loader := NewRuleLoader()
+	engine := NewRuleEngine(loader)
+
+	rule := Rule{
+		ID:       "CRED-DIRECT-SUPPLIER",
+		Name:     "直连供应商检测",
+		Severity: "P0",
+		Matchers: []Matcher{
+			{
+				Type:    "regex_match",
+				Pattern: "(api\\.openai\\.com|api\\.anthropic\\.com|api\\.minimax\\.chat)",
+				Target:  "request_host",
+				Scope:   "all",
+			},
+		},
+		Action: Action{
+			Primary:   "block",
+			Secondary: "alert",
+		},
+	}
+
+	testCases := []struct {
+		name        string
+		input       string
+		shouldMatch bool
+	}{
+		{
+			name:        "直连OpenAI API",
+			input:       "api.openai.com",
+			shouldMatch: true,
+		},
+		{
+			name:        "直连Anthropic API",
+			input:       "api.anthropic.com",
+			shouldMatch: true,
+		},
+		{
+			name:        "通过平台代理",
+			input:       "gateway.platform.com",
+			shouldMatch: false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			matchResult := engine.Match(rule, tc.input)
+			assert.Equal(t, tc.shouldMatch, matchResult.Matched, "Test case: %s", tc.name)
+		})
+	}
+}
+
+// TestCredDirectAPI 测试直连API端点检测
+func TestCredDirectAPI(t *testing.T) {
+	loader := NewRuleLoader()
+	engine := NewRuleEngine(loader)
+
+	rule := Rule{
+		ID:       "CRED-DIRECT-API",
+		Name:     "直连API端点检测",
+		Severity: "P0",
+		Matchers: []Matcher{
+			{
+				Type:    "regex_match",
+				Pattern: "^/v1/(chat/completions|completions|embeddings)$",
+				Target:  "request_path",
+				Scope:   "all",
+			},
+		},
+		Action: Action{
+			Primary: "block",
+		},
+	}
+
+	testCases := []struct {
+		name        string
+		input       string
+		shouldMatch bool
+	}{
+		{
+			name:        "直接访问chat completions",
+			input:       "/v1/chat/completions",
+			shouldMatch: true,
+		},
+		{
+			name:        "直接访问completions",
+			input:       "/v1/completions",
+			shouldMatch: true,
+		},
+		{
+			name:        "平台代理路径",
+			input:       "/api/platform/v1/chat/completions",
+			shouldMatch: false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			matchResult := engine.Match(rule, tc.input)
+			assert.Equal(t, tc.shouldMatch, matchResult.Matched, "Test case: %s", tc.name)
+		})
+	}
+}
+
+// TestCredDirectUnauth 测试未授权直连检测
+func TestCredDirectUnauth(t *testing.T) {
+	loader := NewRuleLoader()
+	engine := NewRuleEngine(loader)
+
+	rule := Rule{
+		ID:       "CRED-DIRECT-UNAUTH",
+		Name:     "未授权直连检测",
+		Severity: "P0",
+		Matchers: []Matcher{
+			{
+				Type:    "regex_match",
+				Pattern: "(direct_ip| bypass_proxy| no_platform_auth)",
+				Target:  "connection_metadata",
+				Scope:   "all",
+			},
+		},
+		Action: Action{
+			Primary:   "block",
+			Secondary: "alert",
+		},
+	}
+
+	testCases := []struct {
+		name        string
+		input       string
+		shouldMatch bool
+	}{
+		{
+			name:        "检测到直连标记",
+			input:       "direct_ip: 203.0.113.50, bypass_proxy: true",
+			shouldMatch: true,
+		},
+		{
+			name:        "正常代理请求",
+			input:       "via: platform_proxy, auth: platform_token",
+			shouldMatch: false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			matchResult := engine.Match(rule, tc.input)
+			assert.Equal(t, tc.shouldMatch, matchResult.Matched, "Test case: %s", tc.name)
+		})
+	}
+}
+
+// TestCredDirectRuleIDFormat 测试规则ID格式
+func TestCredDirectRuleIDFormat(t *testing.T) {
+	loader := NewRuleLoader()
+
+	validIDs := []string{
+		"CRED-DIRECT-SUPPLIER",
+		"CRED-DIRECT-API",
+		"CRED-DIRECT-UNAUTH",
+	}
+
+	for _, id := range validIDs {
+		t.Run(id, func(t *testing.T) {
+			assert.True(t, loader.ValidateRuleID(id), "Rule ID %s should be valid", id)
+		})
+	}
+}