Fix: Create .env symlink in Dockerfile and add APP_KEY placeholder

- Create symlink from /app/code/.env to /app/data/.env in Dockerfile
- Add APP_KEY= placeholder to .env template
- Remove runtime symlink creation attempts
- This fixes key:generate error about missing .env file

Dockerfile

@@ -57,7 +57,8 @@ RUN cd /app/code && \
 
 # Remove storage directory and create symlink to /app/data/storage
 RUN rm -rf /app/code/storage && \
-    ln -s /app/data/storage /app/code/storage
+    ln -s /app/data/storage /app/code/storage && \
+    ln -s /app/data/.env /app/code/.env
 
 # Copy configuration files
 COPY nginx.conf /etc/nginx/sites-available/default