[codex] Add evolutionary heuristic solvers and fix CI build

[japarejo]

What changed

• Added a Java 21 evolutionary-heuristics engine based on jMetal, with NSGA-II and NSGA-III support.
• Added request evaluation, solver configuration, HTTP endpoints, health checks, tests, documentation, and the specialization schema.
• Integrated the engine into Docker Compose and the OpenBinding gateway registry and validation plugin system.
• Pinned MiniZinc's package manager to pnpm@10.12.4.

Why

This adds evolutionary multi-objective and many-objective binding solvers to OpenBinding and exposes them through the existing gateway architecture.

The pnpm pin fixes the CI failure observed while building engine-minizinc. Corepack had started selecting pnpm 11.9.0, which requires Node.js 22.13 or newer and imports node:sqlite, while the engine image intentionally uses Node.js 20. Fixing pnpm at 10.12.4 restores a reproducible, Node 20-compatible build.

Impact

Users can select the new evolutionary-heuristics engine and configure NSGA-II/NSGA-III options through the gateway. Existing MiniZinc builds no longer depend on Corepack's moving default pnpm version.

Validation

• Built engine-evolutionary-heuristics successfully.
• Built engine-minizinc successfully with Node.js 20 and pnpm 10.12.4.
• Started the complete development service set and confirmed every health check passed.
• Ran the gateway test suite: 97 passed, 9 skipped.
• Verified the Compose configuration and Git diff checks.