Add README sections for the two new modules (Mesh LOD and Profiler) and the
track and industry label feature, with settings screenshots, the unified
overlay shot, the three-level LOD comparison, and the label demo video. Update
the module table and remove the profiler-overlay mention from Physics
Optimizer now that the overlay lives in its own module.
Map: per-track industry labels rendered via Dear ImGui on both the popout
and in-game overlay. Three zoom stages - per-track labels, merged same-name
clusters, and one-per-industry labels at wider zoom. Settings: font size
(min/max with zoom scaling), leader lines, parallel rotation, collision
spread, utility track filters (repair/diesel/loader/interchange), zoom
thresholds per category. C# runs a world-space AABB solver at rebuild so
offsets are rotation-invariant; native runs a per-frame screen-space
fine-tuning pass and draws leader lines.
Mesh LOD: new module skeleton with 4-level LOD group injected on
HandleModelsLoaded - three progressive renderer cull tiers (sorted by
bounds volume) plus a 12-tri proxy box at max distance. lodBias-corrected
distance-to-screenHeight conversion. Debounced live refresh on settings
change. Disabled by default.
