feat(tool-config): add categories, interfaces, and config management

Add support for tool categories, interface types, and per-tool configuration.

Backend:
- Add category and interfaces fields to ToolType model
- Create ToolConfig model for storing tool-specific settings
- Add tool_configs API endpoints (CRUD)
- Update built-in tool types with categories and interfaces:
  - code-server: editor, [web]
  - jupyter-notebook: notebook, [web]
  - opencode: ai-assistant, [terminal]
- Update instance API to include tool type interfaces
- Create Alembic migrations 0008 and 0009

Frontend:
- Update ToolType and Session interfaces with new fields
- Conditionally show Open/Terminal buttons based on tool interfaces
- Add API client for tool configs

OpenSpec: tool-config-management change created and implemented.

apps/web/src/components/instance-list.tsx

@@ -147,7 +147,7 @@ export const InstanceList = ({ projectId, repoId, toolTypes }: InstanceListProps
                 </div>
               </div>
               <div className="instance-actions">
-                {instance.status === "running" && instance.url && (
+                {instance.status === "running" && instance.url && instance.tool_type_interfaces.includes("web") && (
                   <a
                     href={`${API_BASE_URL}${instance.url}`}
                     target="_blank"
@@ -158,7 +158,7 @@ export const InstanceList = ({ projectId, repoId, toolTypes }: InstanceListProps
                     Open
                   </a>
                 )}
-                {instance.status === "running" && (
+                {instance.status === "running" && instance.tool_type_interfaces.includes("terminal") && (
                   <button
                     className="secondary-button small"
                     onClick={() => navigate(`/instances/${instance.id}/terminal`)}