Add scatter terrain crates for 32mm miniatures

[Copilot]

Adds procedural STL generation for scatter terrain crates sized for 32mm miniature wargaming. Three crate variants are provided, each with optional open lid and D-ring handle, and no attached miniature base.

New functions (stl_generator.scenery.crates)

• wooden_crate — box body with horizontal plank-line ridges and vertical corner reinforcements
• metal_crate — smooth box body with raised horizontal bands
• wooden_crate_with_bands — wooden crate with additional metal band strips (num_bands param)

All three share the same signature shape:

wooden_crate(
    width=20.0, depth=18.0, height=16.0,  # default 32mm-appropriate dims
    open_lid=False,   # True → hollow shell + rim; False → solid closed top
    handle=False,     # True → D-ring handle on front and back faces
    center=(0, 0, 0), # placement
)

# Example variants
wooden_crate(width=18, height=14)                          # small closed
wooden_crate(open_lid=True, handle=True)                   # open with handles
metal_crate(open_lid=True)                                 # open metal
wooden_crate_with_bands(num_bands=3, handle=True)          # banded wood with handles

All three are exported from stl_generator.scenery and the top-level stl_generator package.

Internal helpers (private)

_solid_box, _open_box_shell, _plank_detail, _corner_strip_detail, _metal_band_detail, _lid_rim, _handle — geometry primitives composited via BaseGenerator.

Original prompt

please make scatter terrain crates scaled for 32mm miniatures. wooden and metal. closed and open lids. some with handles. some wooden with metal bands. no bases

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