feat: migrate to S3 storage with automatic download and timestamped filenames

- Replace local file storage with S3-compatible object storage

- Add automatic PDF download after generation

- Include timestamps in filenames to ensure uniqueness

- Remove unused static volume from Kubernetes deployment

- Update ConfigMap to remove unused variables and add S3 configuration

- Configure S3 credentials via Kubernetes secrets for both dev and prod environments

- Add boto3 dependency for S3 integration

deploy/base/configmap.yaml

@@ -7,8 +7,4 @@ data:
   PORT: "8000"
   LOG_LEVEL: "INFO"
   MAX_REQUEST_SIZE: "10mb"
-  
-  # Security configuration
-  SECURE_COOKIES: "true"
-  CORS_ORIGINS: "math-exercises.local"
   REQUEST_TIMEOUT: "30s"

deploy/base/deployment.yaml

@@ -65,11 +65,3 @@ spec:
         envFrom:
         - configMapRef:
             name: math-exercises-config
-        # Volume mounts for writable directories
-        volumeMounts:
-        - name: static-volume
-          mountPath: /app/app/static
-      # Volumes
-      volumes:
-      - name: static-volume
-        emptyDir: {}