refactor(ssh): consolidate real_ssh into ssh, remove duplication

real_ssh was a separate service name pointing to the same template and
behaviour as ssh. Merged them: ssh is now the single real-OpenSSH service.

- Rename templates/real_ssh/ → templates/ssh/
- Remove decnet/services/real_ssh.py
- Deaddeck archetype updated: services=["ssh"]
- Merge test_real_ssh.py into test_ssh.py (includes deaddeck + logging tests)
- Drop decnet.services.real_ssh from test_build module list

.hypothesis/constants/390b2f90b99b41d6

@@ -0,0 +1,4 @@
+# file: /home/anti/Tools/DECNET/decnet/deployer.py
+# hypothesis_version: 6.151.11
+
+[5.0, ', ', '--build', '--no-cache', '--watch', '-d', '-f', '1', 'DECNET Deckies', 'DOCKER_BUILDKIT', 'Decky', 'Deployed Deckies', 'Hostname', 'IP', 'IPvlan', 'IPvlan L2', 'MACVLAN', 'Services', 'Status', '[green]up[/]', '[red]degraded[/]', 'absent', 'bold', 'build', 'cmdline', 'compose', 'decnet-compose.yml', 'decnet.cli', 'decnet.web.api:app', 'decnet_logging.py', 'docker', 'down', 'green', 'manifest for', 'manifest unknown', 'mutate', 'name', 'not found', 'pid', 'pull access denied', 'red', 'rm', 'running', 'stop', 'templates', 'up', 'uvicorn']