Add task priority field

Introduce a rank-style priority on tasks, scoped by
(organization_id, state). New tasks auto-assign the next
priority. Reordering uses the same CTE-based algorithm as
trust center references and compliance external URLs.
Exposed through GraphQL, MCP, and the PRIORITY order field.

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/server/api/mcp/v1/schema.resolvers.go

@@ -1904,6 +1904,7 @@ func (r *Resolver) UpdateTaskTool(ctx context.Context, req *mcp.CallToolRequest,
 			Name:         input.Name,
 			Description:  UnwrapOmittable(input.Description),
 			State:        input.State,
+			Priority:     input.Priority,
 			TimeEstimate: UnwrapOmittable(input.TimeEstimate),
 			Deadline:     UnwrapOmittable(input.Deadline),
 			AssignedToID: UnwrapOmittable(input.AssignedToID),