Scaffold vpinball-wasm: Emscripten port of Visual Pinball

Build scripts, CMake/source patches, npm packaging, and a Gitea CI
workflow to compile the real Visual Pinball engine (SDL3 + WebGL2 +
libwinevbs for real VBScript) to WebAssembly.

The patches are validated end-to-end: the patched engine boots in a
real browser, loads a real .vpx table, compiles its real GLSL shaders,
computes environment map radiance, initializes physics, and starts the
VBScript engine, before hanging on the one deliberately-deferred piece
of work (game loop rewrite around emscripten_set_main_loop), documented
in the README's roadmap.

package.json

@@ -0,0 +1,28 @@
+{
+	"name": "@valknar/vpinball-wasm",
+	"version": "0.0.0",
+	"description": "Visual Pinball's engine compiled to WebAssembly - real .vpx tables, real VBScript, WebGL2 rendering, in the browser",
+	"license": "SEE LICENSE IN LICENSE",
+	"type": "module",
+	"main": "dist/index.js",
+	"types": "dist/index.d.ts",
+	"files": [
+		"dist/",
+		"package/assets/",
+		"README.md",
+		"LICENSE"
+	],
+	"scripts": {
+		"build:wrapper": "tsc -p package/tsconfig.json"
+	},
+	"publishConfig": {
+		"registry": "https://dev.pivoine.art/api/packages/valknar/npm/"
+	},
+	"repository": {
+		"type": "git",
+		"url": "https://dev.pivoine.art/valknar/vpinball-wasm.git"
+	},
+	"devDependencies": {
+		"typescript": "^5.6.0"
+	}
+}