Revert "feat(cli): implement backend connections for CLI commands"

[Rahul-2k4]

**Summary **

the #148 had some build failure
-report :https://github.com/mofa-org/mofa/pull/148/changes/BASE..b465c443b379faced0c3766b9089a8ba8058e249

[lijingrs]

Hi ALL:
We noticed that many PR checks are failing, which is likely caused by not pulling the latest code.
Our basic check commands are as follows:

cargo clippy --workspace --all-features -- -D errors
cargo test --workspace --all-features
cargo build --examples
cargo doc --workspace --no-deps --all-features
cargo doc --workspace --no-deps --all-features --document-private-items

Please verify this. If you confirm the code is correct, just leave a comment, and we will merge it and test it ourselves.

[Rahul-2k4]

@lijingrs i have rebased and this is a simple revert of the incorrect megred #148 pr after this ill raise a new pr for a correct fix . thank u