feat: complete ForgeDesk-parity calculation workflow

[ichwars]

Summary

• centralize printer and dryer costing in device management
• add real 3MF analysis, multi-operation costing, templates, revisions, and approval warnings
• improve calculation settings and overview UX

Verification

• Backend: 294 relevant tests passed
• Frontend: 2466 tests passed
• ESLint and i18n parity passed
• Production build passed

[chatgpt-codex-connector]

💡 Codex Review

PrintOps/backend/app/services/calculation_engine.py

Lines 129 to 132 in 26c21d7

	energy = (
	inputs.print_hours_per_run * Decimal(runs) * inputs.printer_power_kw
	+ inputs.drying_hours * inputs.dryer_power_kw
	) * inputs.electricity_price_per_kwh

Charge selected dryer depreciation, not just power

When a user explicitly selects a dryer, the UI stores dryer_hourly_rate in provenance and device management exposes the derived hourly cost, but the calculation engine only adds dryer electricity here. Any drying operation therefore omits the dryer's depreciation/maintenance hourly cost from both preview and approval, so quotes using paid dryer equipment are systematically under-costed.

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