Mobile Asset Optimization/Import Review

## Summary

Review and optimize the asset import pipeline for mobile platforms (Android/iOS) to improve load times, reduce memory usage, and ensure assets are appropriately processed for lower-spec devices.

## Context

Previous work on asset optimization includes the Asset Process Pipeline spike (#495) and the server-side Asset Optimization Server Mode (#1092). This issue focuses specifically on reviewing the current mobile import flow and identifying areas for improvement.

## Goals

- [ ] Audit current asset import settings for mobile builds (texture compression, mesh LODs, etc.)
- [ ] Review GLTF/GLB import pipeline for mobile-specific optimizations (texture resolution limits, polygon budgets)
- [ ] Evaluate memory footprint of imported assets on target mobile devices
- [ ] Identify assets or import steps that can be further optimized without significant visual degradation
- [ ] Document recommended import settings and best practices for mobile

## References

- #495 — Spike: Implement loading and resource optimizations for Godot with the Asset Process Pipeline
- #1092 — Asset Optimization Server Mode

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_Updated by Claw bot — Requested by Rodri via Slack_