[SPRINT-2] feat: Complete Portfolio, MLM and Goals UI modules
## ST-2.1 Portfolio UI (5 SP)
- Add CategoryDetailPage for category details and products
- Add ProductDetailPage with variants and prices management
- Add ProductFormPage for create/edit products
- Add 7 components: CategoryTree, CategoryForm, ProductCard, ProductForm,
VariantList, PriceTable, ProductFilters
- Add Portfolio link to sidebar
## ST-2.2 MLM UI (8 SP)
- Add NodesPage with filters and status management
- Add 8 components: NetworkTree, StructureCard, NodeCard, RankBadge,
NodeStatusBadge, MLMStatsCard, DownlineList, CommissionsSummary
- Complete MLM navigation structure
## ST-2.3 Goals UI (8 SP)
- Add AssignmentsPage for goal assignments list
- Add DefinitionFormPage for create/edit goal definitions
- Add 9 components: GoalProgressBar, GoalCard, GoalAssignmentCard,
GoalFilters, GoalForm, ProgressLogList, ProgressLogForm, GoalsKPIGrid
- Complete Goals navigation with all routes
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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