Implement AI orchestration wedding demo

backend/app/ai/tool_registry.py

@@ -0,0 +1,15 @@
+from app.domain.schemas import ToolDefinition
+
+
+class ToolRegistry:
+    def __init__(self, tools: list[ToolDefinition]) -> None:
+        self._tools = {tool.name: tool for tool in tools}
+
+    def list(self) -> list[ToolDefinition]:
+        return list(self._tools.values())
+
+    def get(self, name: str) -> ToolDefinition | None:
+        return self._tools.get(name)
+
+    def names(self) -> set[str]:
+        return set(self._tools)