feat: V1 -> V2 addon migration

- Moved addon/ → src/, test-support/ → src/test-support/
- Moved tests/dummy/app/ → demo-app/
- Added V2 build infrastructure (rollup, vite, babel configs)
- Updated package.json for v2 addon format
- Fixed import paths for v2 layout
- Added demo-app CSS import in test-helper

Author: BobrImperator

.ember-cli

@@ -0,0 +1 @@
+NODE_ENV=development

.env.development

@@ -1,22 +1,28 @@
 # compiled output
 /dist/
+/dist-tests/
 /declarations/
 
-# dependencies
-/node_modules/
+# from scenarios
+tmp/
+config/optional-features.json
+ember-cli-build.cjs
+
+# deps & caches
+node_modules/
+.eslintcache
+.prettiercache
+
+# potentially containing secrets
+*.local
 
 # misc
-/.env*
 /.pnp*
-/.eslintcache
 /coverage/
 /npm-debug.log*
 /testem.log
 /yarn-error.log
 
-# broccoli-debug
-/DEBUG/
-
 # IDE
 /.idea/
 /*.iml

.gitignore

@@ -1,6 +1,4 @@
-'use strict';
-
-module.exports = {
+export default {
   plugins: ['prettier-plugin-ember-template-tag'],
   overrides: [
     {

.prettierrc.js .prettierrc.mjs.prettierrc.js renamed to .prettierrc.mjs

@@ -0,0 +1,4 @@
+export default {
+  extends: 'recommended',
+  checkHbsTemplateLiterals: false,
+};

.template-lintrc.js

@@ -14,12 +14,12 @@
 ## Running tests
 
 - `pnpm test` – Runs the test suite on the current Ember version
-- `pnpm test:ember --server` – Runs the test suite in "watch mode"
-- `pnpm test:ember-compatibility` – Runs the test suite against multiple Ember versions
 
-## Running the dummy application
+## Running the demo application
 
 - `pnpm start`
-- Visit the dummy application at [http://localhost:4200](http://localhost:4200).
+- Visit the demo application at [http://localhost:5173](http://localhost:5173).
 
-For more information on using ember-cli, visit [https://cli.emberjs.com/release/](https://cli.emberjs.com/release/).
+## Building
+
+- `pnpm build` – Builds the addon for publishing

.template-lintrc.mjs

@@ -0,0 +1,4 @@
+'use strict';
+
+const { addonV1Shim } = require('@embroider/addon-shim');
+module.exports = addonV1Shim(__dirname);