feat: bump version to 1.4.0 and update system template 🚀

- Update version from 1.3.3 to 1.4.0 in Cargo.toml
- Enhance system template with additional instructions
- Simplify and clarify template content for better usability
- Remove redundant information to streamline template
- Ensure template aligns with latest commit message standards

Signed-off-by: mingcheng <mingcheng@apache.org>

Author: mingcheng