[Seed Data] Generate Work Packages with Timeline Logic

[Steph375]

Description

• Generate work packages for projects using the project timelines from seed context.
• Work packages should create realistic project structure and support later task generation.
• Include functionality where earlier work packages can block later work packages.
• Each work package should be created with its required WBS element.

Acceptance Criteria

• Each project gets 0–8 work packages.
• Average work package count is around 5.
• Work packages belong to valid projects via projectId.
• Each work package has a valid wbsElementId.
• Each work package has a valid orderInProject.
• Work package dates stay inside the project timeline.
• Blocking relationships only reference earlier work packages in the same project.
• Blocked work packages start after blocker end dates.
• Generated work packages are stored in ctx.workPackages.

Proposed Solution

• Add prisma/seed/factories/workPackageFactory.ts
• Create createSeedWorkPackage(ctx, project, overrides?)
• Create generateSeedWorkPackages(ctx)
• Use ctx.projectTimelines[project.projectId] to determine valid date ranges.
• Create a WBS_Element before creating each Work_Package.
• Store generated work package timelines in context so task generation can use them later.