Add 3D engine stubs for Windows native layer

The Windows native layer was missing 40 extern "C" functions for the 3D
scene graph, lighting, shadows, and picking subsystems. These are
implemented on macOS but not yet on Windows. Without them, linking fails
when the Bloom TypeScript wrappers reference them. Added no-op stubs so
2D games (like Bloom Jump) can compile and run on Windows.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Ralph Kuepper

native/windows/Cargo.lock

@@ -1178,3 +1178,45 @@ fn pollster_block_on<F: std::future::Future>(future: F) -> F::Output {
         }
     }
 }
+
+// 3D engine stubs — not yet implemented on Windows
+#[no_mangle] pub extern "C" fn bloom_register_frame_callback(_priority: f64, _callback: extern "C" fn(f64)) -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_unregister_frame_callback(_id: f64) {}
+#[no_mangle] pub extern "C" fn bloom_add_directional_light(_dx: f64, _dy: f64, _dz: f64, _r: f64, _g: f64, _b: f64, _intensity: f64) {}
+#[no_mangle] pub extern "C" fn bloom_add_point_light(_x: f64, _y: f64, _z: f64, _range: f64, _r: f64, _g: f64, _b: f64, _intensity: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_create_node() -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_scene_destroy_node(_handle: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_set_visible(_handle: f64, _visible: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_set_cast_shadow(_handle: f64, _cast: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_set_receive_shadow(_handle: f64, _receive: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_set_parent(_handle: f64, _parent: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_set_transform(_handle: f64, _mat_ptr: *const f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_update_geometry(_handle: f64, _vert_ptr: *const f64, _vert_count: f64, _idx_ptr: *const f64, _idx_count: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_set_material_color(_handle: f64, _r: f64, _g: f64, _b: f64, _a: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_set_material_pbr(_handle: f64, _roughness: f64, _metalness: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_set_material_texture(_handle: f64, _texture_idx: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_node_count() -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_scene_node_vertex_count(_handle: f64) -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_scene_node_index_count(_handle: f64) -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_scene_extrude_polygon(_handle: f64, _polygon_ptr: *const f64, _polygon_count: f64, _depth: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_subtract_box(_handle: f64, _min_x: f64, _min_y: f64, _min_z: f64, _max_x: f64, _max_y: f64, _max_z: f64) {}
+#[no_mangle] pub extern "C" fn bloom_enable_shadows() {}
+#[no_mangle] pub extern "C" fn bloom_disable_shadows() {}
+#[no_mangle] pub extern "C" fn bloom_enable_postfx() {}
+#[no_mangle] pub extern "C" fn bloom_disable_postfx() {}
+#[no_mangle] pub extern "C" fn bloom_postfx_set_selected(_handle: f64) {}
+#[no_mangle] pub extern "C" fn bloom_postfx_set_hovered(_handle: f64) {}
+#[no_mangle] pub extern "C" fn bloom_postfx_set_outline_color(_r: f64, _g: f64, _b: f64, _a: f64) {}
+#[no_mangle] pub extern "C" fn bloom_postfx_set_outline_thickness(_thickness: f64) {}
+#[no_mangle] pub extern "C" fn bloom_project_to_screen(_wx: f64, _wy: f64, _wz: f64) -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_project_screen_y() -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_scene_attach_model(_node_handle: f64, _model_handle: f64, _mesh_index: f64) {}
+#[no_mangle] pub extern "C" fn bloom_scene_pick(_screen_x: f64, _screen_y: f64) -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_pick_hit_handle() -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_pick_hit_distance() -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_pick_hit_x() -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_pick_hit_y() -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_pick_hit_z() -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_pick_hit_normal_x() -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_pick_hit_normal_y() -> f64 { 0.0 }
+#[no_mangle] pub extern "C" fn bloom_pick_hit_normal_z() -> f64 { 0.0 }