Improve netcode and simplify (#4)

- Simplify the logic wherever possible to remove overengineering and simplify the netcode
- Actually improve the netcode
- The new lines are mainly the package locks and tests

Reviewed-on: https://home.schmelczer.dev/git/andras/decla-red/pulls/4

test/setup.mjs

@@ -0,0 +1,13 @@
+// Use production's f64 vector type in every package. The import-order regression separately
+// verifies that physics constants also retain full precision before startup configures it.
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
+
+for (const path of [
+  '../shared/node_modules/gl-matrix',
+  '../backend/node_modules/gl-matrix',
+  '../frontend/node_modules/gl-matrix',
+]) {
+  require(path).glMatrix.setMatrixArrayType(Array);
+}