refactor to use Tasker interface instead of Task

add tasker register for registering tasks for extiensibility

pkg/task/register.go

@@ -0,0 +1,32 @@
+package task
+
+import (
+	"fmt"
+
+	"github.com/LazyBachelor/LazyPM/internal/service"
+)
+
+var registry = make(map[string]func(*service.Services) Tasker)
+
+func Register(name string, constructor func(*service.Services) Tasker) {
+	if _, exists := registry[name]; exists {
+		panic(fmt.Sprintf("task %q already registered", name))
+	}
+	registry[name] = constructor
+}
+
+func Get(name string, svc *service.Services) (Tasker, error) {
+	constructor, ok := registry[name]
+	if !ok {
+		return nil, fmt.Errorf("task %q not found", name)
+	}
+	return constructor(svc), nil
+}
+
+func List() []string {
+	names := make([]string, 0, len(registry))
+	for name := range registry {
+		names = append(names, name)
+	}
+	return names
+}