feat: add CLI commands and server default behavior

- Introduced CLI commands for server, login, upload, sign, verify, and more using `clap`.
- Updated Dockerfile and docker-compose to default to `server` command on startup.
- Enhanced `test_local.sh` for testing the server and client operations.
- Added multipart support to `reqwest` and new CLI documentation in `README.md`.
- Updated `Cargo.toml` with new dependencies to support CLI and multipart uploads.

docker-compose.yml

@@ -39,6 +39,8 @@ services:
     deploy:
       restart_policy:
         condition: none
+    # Run with 'server' command
+    command: server --vault-addr http://vault:8200 --api-port 3000
 
 volumes:
   vault-data: