Add prefix/suffix support, short ID fallback, unit docs

- config: add Prefix/Suffix fields to Config struct
- systemd: ServiceName/Generate/UnitPath/Install/Uninstall/Enable/Disable/Status all accept prefix+suffix
- runtime: fall back to short container ID (12 chars) when container has no name
- cmd: active, status, install all thread prefix/suffix from config
- systemd/generator_test.go: updated all calls + added TestGenerate_WithPrefixSuffix
- docs/generated-units.md: full examples of every unit type + ordering + naming
- README: updated config docs, prefix/suffix section, link to docs/

cmd/status.go

@@ -36,6 +36,8 @@ func runStatus(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
+	prefix, suffix := cfg.Prefix, cfg.Suffix
+
 	if len(cfg.Units) == 0 {
 		fmt.Println("No units configured. Run 'unitdore syncup' to discover containers.")
 		return nil
@@ -63,13 +65,13 @@ func runStatus(cmd *cobra.Command, args []string) error {
 		}
 
 		installed := "yes"
-		if !systemd.IsInstalled(u) {
+		if !systemd.IsInstalled(u, prefix, suffix) {
 			installed = "no"
 		}
 
 		state := "—"
-		if systemd.IsInstalled(u) {
-			state = systemd.Status(u)
+		if systemd.IsInstalled(u, prefix, suffix) {
+			state = systemd.Status(u, prefix, suffix)
 		}
 
 		rows = append(rows, statusRow{