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/console/v1/schema.graphql

@@ -499,6 +499,7 @@ enum MeasureOrderField
 
 enum TaskOrderField
     @goModel(model: "go.probo.inc/probo/pkg/coredata.TaskOrderField") {
+    PRIORITY
     CREATED_AT
 }
 
@@ -2392,6 +2393,7 @@ type Task implements Node {
     name: String!
     description: String
     state: TaskState!
+    priority: Int!
     timeEstimate: Duration
     deadline: Datetime
     assignedTo: Profile @goField(forceResolver: true)
@@ -4211,6 +4213,7 @@ input UpdateTaskInput {
     name: String
     description: String @goField(omittable: true)
     state: TaskState
+    priority: Int
     timeEstimate: Duration @goField(omittable: true)
     deadline: Datetime @goField(omittable: true)
     assignedToId: ID @goField(omittable: true)

pkg/server/api/console/v1/types/task.go

@@ -70,6 +70,7 @@ func NewTask(t *coredata.Task) *Task {
 		Name:         t.Name,
 		Description:  t.Description,
 		State:        t.State,
+		Priority:     t.Priority,
 		TimeEstimate: t.TimeEstimate,
 		Deadline:     t.Deadline,
 		CreatedAt:    t.CreatedAt,

pkg/server/api/console/v1/v1_resolver.go

@@ -3766,6 +3766,7 @@ func (r *mutationResolver) UpdateTask(ctx context.Context, input types.UpdateTas
 			Name:         input.Name,
 			Description:  gqlutils.UnwrapOmittable(input.Description),
 			State:        input.State,
+			Priority:     input.Priority,
 			TimeEstimate: gqlutils.UnwrapOmittable(input.TimeEstimate),
 			Deadline:     gqlutils.UnwrapOmittable(input.Deadline),
 			AssignedToID: gqlutils.UnwrapOmittable(input.AssignedToID),