Add VROOM capacity-only vehicle packing bias

[roncodes]

Summary

• Adds VROOM capacity-only vehicle packing policy support with minimize-vehicles as the default.
• Adds fixed vehicle costs to capacity-only VROOM payloads so VROOM prefers filling feasible vehicles before opening another vehicle.
• Adds an orchestrator UI packing selector for VROOM capacity-only phases.
• Moves the VROOM orchestration test seeder under server/seeders/Testing so deploy seeding does not auto-run it.

Behavior

• Supports options.vehicle_packing values: minimize_vehicles, balanced, none.
• Supports options.vehicle_fixed_cost with default 100000.
• Route-aware VROOM allocation remains unchanged.

Validation

• php -l server/src/Orchestration/Engines/VroomOrchestrationEngine.php
• php -l server/tests/VroomOrchestrationEngineTest.php
• php -l server/seeders/Testing/VroomOrchestrationSeeder.php
• npx eslint addon/components/orchestrator/phase-builder.js addon/components/orchestrator-workbench.js
• npx ember-template-lint addon/components/orchestrator/phase-builder.hbs
• git diff --check

Local test blocker

• ./server_vendor/bin/pest server/tests/VroomOrchestrationEngineTest.php is blocked locally because server_vendor/pestphp/pest/vendor/autoload.php is missing and Symfony Console classes are unavailable in this checkout.