Initial commit: DECNET honeypot/deception network framework

Core CLI, service plugins (SSH/SMB/FTP/HTTP/RDP), Docker Compose
orchestration, MACVLAN networking, and Logstash log forwarding.

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

decnet/services/registry.py

@@ -0,0 +1,43 @@
+"""
+Service plugin registry.
+
+Auto-discovers all BaseService subclasses by importing every module in the
+services package. Adding a new service requires nothing beyond dropping a
+new .py file here that subclasses BaseService.
+"""
+
+import importlib
+import pkgutil
+from pathlib import Path
+
+from decnet.services.base import BaseService
+
+_registry: dict[str, BaseService] = {}
+_loaded = False
+
+
+def _load_plugins() -> None:
+    global _loaded
+    if _loaded:
+        return
+    package_dir = Path(__file__).parent
+    for module_info in pkgutil.iter_modules([str(package_dir)]):
+        if module_info.name in ("base", "registry"):
+            continue
+        importlib.import_module(f"decnet.services.{module_info.name}")
+    for cls in BaseService.__subclasses__():
+        instance = cls()
+        _registry[instance.name] = instance
+    _loaded = True
+
+
+def get_service(name: str) -> BaseService:
+    _load_plugins()
+    if name not in _registry:
+        raise KeyError(f"Unknown service: '{name}'. Available: {list(_registry)}")
+    return _registry[name]
+
+
+def all_services() -> dict[str, BaseService]:
+    _load_plugins()
+    return dict(_registry)