Refactor: Consolidate duplicate Prisma task select types

[tomsmith8]

Problem

We have duplicate Prisma select definitions for roadmap tasks scattered across multiple files. When adding a new field like stakworkProjectId, it required updates in 7+ places:

• src/types/roadmap.tsx - RoadmapTaskListItemBase
• src/types/roadmap.tsx - FeatureDetail.phases.tasks
• src/types/roadmap.tsx - PhaseWithTasks.tasks
• src/services/roadmap/phases.ts - getPhase()
• src/services/roadmap/tickets.ts - createTicket()
• src/services/roadmap/tickets.ts - updateTicket()
• src/services/roadmap/tickets.ts - reorderTasks()
• src/app/api/features/[featureId]/route.ts - GET handler (2 places)

This is error-prone and violates DRY.

Proposed Solution

Create a shared constant for the task select shape:

// src/lib/prisma-selects.ts
export const ROADMAP_TASK_SELECT = {
  id: true,
  title: true,
  description: true,
  status: true,
  priority: true,
  order: true,
  featureId: true,
  phaseId: true,
  bountyCode: true,
  stakworkProjectId: true,
  dependsOnTaskIds: true,
  createdAt: true,
  updatedAt: true,
  assignee: {
    select: {
      id: true,
      name: true,
      email: true,
      image: true,
    },
  },
  phase: {
    select: {
      id: true,
      name: true,
    },
  },
} as const;

Then derive the TypeScript type from it and reuse everywhere.

Benefits

• Single source of truth for task shape
• Adding new fields requires only 1 change
• Type safety maintained via Prisma.TaskGetPayload<{ select: typeof ROADMAP_TASK_SELECT }>

Files to Update

• Create src/lib/prisma-selects.ts
• Update src/types/roadmap.tsx to derive types from constants
• Update all service files to use shared selects
• Update API routes to use shared selects