feat: Implement door interaction system and UI improvements

- Add interactive door system with click detection on door meshes
- Create custom DoorModal component replacing browser confirm()
- Implement door opening with texture change to door1_open.png
- Add additive door rendering to preserve opened doors
- Remove exploration button and requestExploration method
- Implement camera orbit controls with smooth animations
- Add active view indicator (yellow highlight) on camera buttons
- Add vertical zoom slider with label
- Fix camera to maintain isometric perspective while rotating
- Integrate all systems into main game loop

Dockerfile.dev

@@ -0,0 +1,13 @@
+FROM node:20-slim
+
+WORKDIR /app
+
+# Copy package files and install dependencies
+COPY package*.json ./
+RUN npm install
+
+# Expose Vite dev server port
+EXPOSE 5173
+
+# Start development server
+CMD ["npm", "run", "dev", "--", "--host", "0.0.0.0"]