[MAE-015] feat: Implement assets module backend
Complete implementation of the Assets/Machinery/Maintenance module:
Entities (10):
- AssetCategory: Hierarchical asset categorization with depreciation config
- Asset: Main asset entity (machinery, vehicles, tools, equipment)
- AssetAssignment: Asset-to-project assignments tracking
- WorkOrder: Maintenance work orders with workflow
- WorkOrderPart: Parts/materials used in work orders
- MaintenancePlan: Preventive maintenance plans
- MaintenanceHistory: Historical maintenance records
- FuelLog: Fuel consumption tracking with efficiency calculation
- AssetCost: TCO (Total Cost of Ownership) tracking
Services (3):
- AssetService: CRUD, assignments, categories, statistics
- WorkOrderService: CRUD, workflow (start/hold/resume/complete/cancel), parts
- FuelLogService: CRUD, efficiency calculation, statistics
Controllers (3):
- AssetController: REST API for assets, assignments, categories
- WorkOrderController: REST API for work orders, workflow, plans
- FuelLogController: REST API for fuel logs, statistics
Features:
- Multi-tenant support with tenant_id
- Complete workflow for work orders (draft→scheduled→in_progress→completed)
- Automatic efficiency calculation for fuel consumption
- Asset assignment history tracking
- Maintenance plan generation
- TCO tracking by cost type
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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