Implement unified SSH command management with dedicated scripts

- Replace complex SSH command patterns with simple script calls
- Create service-manage script for start/stop operations with proper logging
- Create rebuild script equivalent to rebuild_git alias with user feedback
- Update dashboard to use unified command pattern: sudo service-manage, sudo rebuild
- Simplify backup to use service management: service-manage start borgbackup
- Configure sudoers with wildcards for Nix store path compatibility
- Remove cmtec references from script names for better genericity
- Update version to 0.1.90

dashboard/src/config/mod.rs

@@ -55,8 +55,8 @@ pub struct SystemConfig {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct SshConfig {
     pub rebuild_user: String,
-    pub rebuild_alias: String,
-    pub backup_alias: String,
+    pub rebuild_cmd: String,
+    pub service_manage_cmd: String,
 }
 
 /// Service log file configuration per host