feat(capabilities): add in-process verb store

surfsense_backend/app/capabilities/store.py

@@ -0,0 +1,20 @@
+"""In-process capability registry, populated at import by each verb's ``definition.py``."""
+
+from __future__ import annotations
+
+from app.capabilities.types import Capability
+
+_REGISTRY: dict[str, Capability] = {}
+
+
+def register_capability(capability: Capability) -> None:
+    """Add (or replace) a verb by name."""
+    _REGISTRY[capability.name] = capability
+
+
+def get_capability(name: str) -> Capability:
+    return _REGISTRY[name]
+
+
+def all_capabilities() -> list[Capability]:
+    return list(_REGISTRY.values())