feat: make max file size configurable via asset upload settings

[andrey-canon]

Description

This PR makes the maximum file size for asset uploads configurable through the application configuration.

Previously, the limit was hardcoded to a fixed value. Now, the system attempts to fetch MAX_ASSET_UPLOAD_FILE_SIZE_IN_MB from the configuration. If this value is not defined or the API call fails, it gracefully falls back to the constant UPLOAD_FILE_MAX_SIZE.

Issue # 1725
Migration pr of #28

Changes

• Replaced hardcoded maxFileSize constant with a dynamic configuration lookup.
• Added a fallback mechanism to ensure uploads continue to work even if the configuration is missing.
• Converted the configuration value (MB) to bytes for internal validation logic.

Screenshots

Before

• Hardcoded value: 20 * 1048576 (Fixed 20MB).

After

• Dynamic value: getConfig().MAX_ASSET_UPLOAD_FILE_SIZE_IN_MB with fallback to UPLOAD_FILE_MAX_SIZE.