feat(M34): dynamic issuer configuration with encrypted config storage

Replace static env-var-based issuer wiring with GUI-driven dynamic
configuration stored encrypted in PostgreSQL. Operators can now
configure, test, enable/disable, and manage issuers from the dashboard
without restarting the server.

Key changes:
- AES-256-GCM encryption for sensitive issuer config at rest (PBKDF2
  key derivation with 100k iterations)
- Dynamic IssuerRegistry with sync.RWMutex replacing static map
- Connector factory pattern (issuerfactory.NewFromConfig) replacing
  140 lines of static wiring in main.go
- Migration 000009: encrypted_config, last_tested_at, test_status,
  source columns on issuers table
- Env var seeding on first boot with ON CONFLICT DO NOTHING
- Registry Rebuild() for atomic map swap after CRUD operations
- Issuer type validation against domain constants on Create
- Audit trail for test connection results
- Conditional seeding for step-ca/OpenSSL (only when env vars set)
- GUI: source badge, connection test status on issuer detail page

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

internal/service/shortlived_test.go

@@ -3,6 +3,7 @@ package service
 import (
 	"context"
 	"errors"
+	"log/slog"
 	"testing"
 	"time"
 
@@ -18,9 +19,8 @@ func setupShortLivedTestService(
 ) *RenewalService {
 	auditSvc := NewAuditService(auditRepo)
 
-	issuerRegistry := map[string]IssuerConnector{
-		"iss-test": &mockIssuerConnector{},
-	}
+	issuerRegistry := NewIssuerRegistry(slog.Default())
+	issuerRegistry.Set("iss-test", &mockIssuerConnector{})
 
 	svc := NewRenewalService(
 		certRepo,
@@ -137,9 +137,8 @@ func TestExpireShortLivedCertificates_ListError(t *testing.T) {
 
 	// Create the service manually to use our custom cert repo
 	auditSvc := NewAuditService(auditRepo)
-	issuerRegistry := map[string]IssuerConnector{
-		"iss-test": &mockIssuerConnector{},
-	}
+	issuerRegistry := NewIssuerRegistry(slog.Default())
+	issuerRegistry.Set("iss-test", &mockIssuerConnector{})
 
 	svc := NewRenewalService(
 		customCertRepo,
@@ -385,9 +384,8 @@ func TestExpireShortLivedCertificates_NoProfileRepository(t *testing.T) {
 	}
 
 	auditSvc := NewAuditService(auditRepo)
-	issuerRegistry := map[string]IssuerConnector{
-		"iss-test": &mockIssuerConnector{},
-	}
+	issuerRegistry := NewIssuerRegistry(slog.Default())
+	issuerRegistry.Set("iss-test", &mockIssuerConnector{})
 
 	svc := NewRenewalService(
 		certRepo,