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/

systemd/generator.go

@@ -51,17 +51,17 @@ type templateData struct {
 	ExecStop    string
 }
 
-// ServiceName returns the systemd service name for a unit.
-func ServiceName(u config.Unit) string {
-	return fmt.Sprintf("unitdore-%s.service", u.Name)
+// ServiceName returns the systemd service name for a unit, with optional prefix/suffix.
+func ServiceName(u config.Unit, prefix, suffix string) string {
+	return fmt.Sprintf("unitdore-%s%s%s.service", prefix, u.Name, suffix)
 }
 
 // Generate produces the .service file content for a unit.
-func Generate(u config.Unit) (string, error) {
+func Generate(u config.Unit, prefix, suffix string) (string, error) {
 	execStart, execStop := buildExecCommands(u)
 
 	data := templateData{
-		ServiceName: ServiceName(u),
+		ServiceName: ServiceName(u, prefix, suffix),
 		Unit:        u,
 		ExecStart:   execStart,
 		ExecStop:    execStop,