feat: add initial implementation of ECS architecture and systems

- Introduced a minimal Entity-Component-System (ECS) framework in `ecs.ts` with basic entity management and component handling.
- Created `World` class to manage entities and components, including methods for creating, adding, retrieving, and removing components.
- Implemented unit tests for the `World` class in `ecs.test.ts` to ensure functionality.
- Developed input handling with `InputSystem` to capture keyboard events.
- Added `PhysicsSystem` for movement and collision detection.
- Created `RenderSystem` to handle drawing entities on the canvas.
- Set up a main game loop in `main.ts` to integrate systems and manage game state.
- Added SVG icons and images for UI elements.
- Included CSS styles for layout and theming.
- Configured TypeScript settings in `tsconfig.json` for project compilation.

Co-authored-by: Copilot <copilot@github.com>

package.json

@@ -0,0 +1,19 @@
+{
+  "name": "client",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc && vite build",
+    "preview": "vite preview",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "devDependencies": {
+    "typescript": "~6.0.2",
+    "vite": "^8.0.10",
+    "vitest": "^1.6.0",
+    "jsdom": "^24.1.0"
+  }
+}