Bump OCCT to 8.0.0-beta1 and migrate freshly-deprecated APIs

[gsdali]

Summary

• Bumps OCCT static dep from V8_0_0_rc5 to V8_0_0_beta1 (feature-freeze tag; final 8.0.0 planned 2026-05-07).
• Migrates two new beta1 deprecation classes in src/occt_templot_io.cpp: Standard_False/True -> false/true (3 sites), and TColStd_IndexedDataMapOfStringString -> NCollection_IndexedDataMap<TCollection_AsciiString, TCollection_AsciiString> (2 sites in glTF/PLY writer calls).
• No source changes elsewhere — our codebase touches none of the removed/renamed beta1 surfaces (BRepGraph, NCollection_Vector, IVtk SetTolerance, V3d grids).

What we get for free from the rebuild

• PR #940 — BRepMesh_BaseMeshAlgo node-registration fix → better internal-vertex tracking under ot_mesh_shape.
• PR #1195 — TopExp_Explorer::Clear() allocation reuse → hot-path win in our face-walk loops.
• PR #1227 / #1247 — ShapeFix cycle rejection + DFS guards → eliminates stack-overflow class of bugs in ot_heal_shape* on shapes with shared sub-shapes.
• PR #924 — BVH-accelerated polyhedra interference → O(log n) instead of pairwise scans.
• PR #1212 — Lock-free NCollection_IncAllocator fast path.

Out of scope

The marquee "new mesh storage" feature (BRepGraph_MeshCache / BRepGraph_MeshView) is tied to the new BRepGraph data structure (parallel to TopoDS_Shape, not a drop-in cache). Adopting it is a multi-week rearchitecture and is left to its own initiative.

Test plan

• OCCT 8.0.0 beta1 builds clean locally on macOS arm64 (50 static libs, 6874 headers, all 8 required toolkits resolved).
• simpleOCCTVP rebuilds with zero warnings against beta1.
• ctest 4/4 green on macOS arm64 (test_io, test_heal, test_viewer, test_render_data).
• Linux CI build (Dockerfile.test) — run via PR checks.
• Windows CI build — run via PR checks.

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