feat(outbound): Postgres repository for outbound_connections

- PostgresOutboundConnectionRepository: JdbcTemplate impl of
  OutboundConnectionRepository; UUID arrays via ConnectionCallback,
  JSONB for headers/auth/ca-paths, enum casts for method/trust/auth-kind
- OutboundBeanConfig: wires the repo + SecretCipher beans
- PostgresOutboundConnectionRepositoryIT: 5 Testcontainers tests
  (save+read, unique-name, allowed-env-ids round-trip, tenant isolation,
  delete); validates V11 Flyway migration end-to-end
- application-test.yml: add jwtsecret default so SecretCipher bean
  starts up in the Spring test context

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

cameleer-server-app/src/test/resources/application-test.yml

@@ -16,3 +16,4 @@ cameleer:
       bootstraptoken: test-bootstrap-token
       bootstraptokenprevious: old-bootstrap-token
       infrastructureendpoints: true
+      jwtsecret: test-jwt-secret-for-integration-tests-only