v1.1.2

Release v1.1.2: Force calculation fixes and Virtual Work improvements

- Fix Amperian force sign (F = J × B): Fx = -Jz·By, Fy = +Jz·Bx
- Fix Virtual Work sign (F = +dW'/dx for constant-current systems)
- Fix sliding simulation energy calculation (static cache issue)
- Fix WebUI YAML autocomplete for anderson:: nested settings
- Fix installer version display

- Implement magnetic co-energy calculation W' = ∫B dH for nonlinear materials
- Simpson's rule integration for accurate nonlinear co-energy
- Both Virtual Work and Amperian methods now give consistent results

- For current-source systems (Jz specified): F = +∂W'/∂x|_I
- For flux-source systems: F = -∂W/∂x|_λ
- Amperian F = J × B is always valid, independent of energy formulation