feat(M47): add Kubernetes Secrets target + AWS ACM PCA issuer connectors

Implement both M47 connectors with full cross-layer wiring:

Kubernetes Secrets target: DNS-1123 validation, kubernetes.io/tls Secret
create-or-update, chain concatenation, serial number validation, Helm
RBAC gating. 18 tests.

AWS ACM Private CA issuer: synchronous issuance (like Vault), ARN regex
validation, RFC 5280 revocation reason mapping, CA cert retrieval,
factory + env var seeding. 23 tests.

Cross-cutting: domain types, service validation, config, factory, agent
dispatch, frontend (TargetsPage, issuerTypes), OpenAPI, seed data, Helm
chart, connectors docs, README. Testing docs (testing-guide, qa-test-guide,
qa_test.go) with Parts thematically integrated near related connectors.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/service/issuer.go

@@ -90,6 +90,7 @@ var validIssuerTypes = map[domain.IssuerType]bool{
 	domain.IssuerTypeDigiCert:  true,
 	domain.IssuerTypeSectigo:   true,
 	domain.IssuerTypeGoogleCAS: true,
+	domain.IssuerTypeAWSACMPCA: true,
 }
 
 // isValidIssuerType checks if a type string is a known issuer type.
@@ -482,6 +483,26 @@ func (s *IssuerService) buildEnvVarSeeds(cfg *config.Config) []*domain.Issuer {
 		})
 	}
 
+	// Conditional: AWS ACM PCA
+	if cfg.AWSACMPCA.CAArn != "" {
+		seeds = append(seeds, &domain.Issuer{
+			ID:   "iss-awsacmpca",
+			Name: "AWS ACM Private CA",
+			Type: domain.IssuerTypeAWSACMPCA,
+			Config: mustJSON(map[string]interface{}{
+				"region":            cfg.AWSACMPCA.Region,
+				"ca_arn":            cfg.AWSACMPCA.CAArn,
+				"signing_algorithm": cfg.AWSACMPCA.SigningAlgorithm,
+				"validity_days":     cfg.AWSACMPCA.ValidityDays,
+				"template_arn":      cfg.AWSACMPCA.TemplateArn,
+			}),
+			Enabled:   true,
+			Source:    "env",
+			CreatedAt: now,
+			UpdatedAt: now,
+		})
+	}
+
 	return seeds
 }
 

internal/service/target.go

@@ -24,9 +24,10 @@ var validTargetTypes = map[domain.TargetType]bool{
 	domain.TargetTypeEnvoy:   true,
 	domain.TargetTypePostfix: true,
 	domain.TargetTypeDovecot: true,
-	domain.TargetTypeSSH:          true,
-	domain.TargetTypeWinCertStore: true,
-	domain.TargetTypeJavaKeystore: true,
+	domain.TargetTypeSSH:               true,
+	domain.TargetTypeWinCertStore:      true,
+	domain.TargetTypeJavaKeystore:      true,
+	domain.TargetTypeKubernetesSecrets: true,
 }
 
 // isValidTargetType checks if a type string is a known target type.