Fix BendConstraint::solve signature mismatch with base class

[Copilot]

BendConstraint::solve declared a different parameter list than the pure virtual Constraint::solve(std::vector<physics::Vertex>&, float), making the override invalid and the class non-instantiable.

Changes

• BendConstraint.hpp

  • Drop extra std::vector<glm::vec3>& lagrangeMultipliers param and const to match base class signature
  • Add missing #pragma once
  • Initialize restAngle = 0.0f

• BendConstraint.cpp

  • Update definition to match corrected signature
  • Replace lagrangeMultipliers[0].x with the inherited protected lambda member (already reset by Constraint::resetLambda())
  • Fix include path: "app/physics/constraints/BendConstraint.hpp" → <physics/constraints/BendConstraint.hpp>
  • Remove stale precondition comment referencing lagrange multipliers

Before / After:

// Before — mismatched, won't compile with override
virtual void solve(std::vector<physics::Vertex>&, std::vector<glm::vec3>&, float) const override;

// After — correctly overrides base class
void solve(std::vector<physics::Vertex>& vertices, float deltatime) override;

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