feat: initialize ColorLine98 project with Vue 3 + Vite + TypeScript

- Scaffold Vue 3 + Vite + TypeScript project
- Add ESLint + Prettier configuration
- Create project structure: src/game/, src/components/, src/assets/
- Implement core game modules: Board, PathFinder (BFS), LineChecker
- Add README with project description and setup instructions

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.vscode/extensions.json

@@ -0,0 +1,3 @@
+{
+  "recommendations": ["Vue.volar"]
+}