fix(host-contracts): bump defender-sdk-base-client to 2.7.1 via lockfile (#1868)

* fix(host-contracts): add explicit axios dependency

Add axios ^1.13.4 to devDependencies to fix compatibility with
@openzeppelin/defender-sdk which requires axios>=1.8.0.

Related: OpenZeppelin/defender-sdk#822

* fix(root): add explicit package name to stabilize lockfile

Add "name": "fhevm" to root package.json to prevent npm from deriving
the name from the worktree directory name, which was causing the
package-lock.json name to change between environments.

* fix(host-contracts): bump defender-sdk-base-client to 2.7.1 via lockfile

Remove explicit axios workaround now that the upstream fix has shipped
in @openzeppelin/defender-sdk-base-client@2.7.1.

Ref: OpenZeppelin/defender-sdk#822
Ref: OpenZeppelin/openzeppelin-upgrades#1205

Author: enitrat