docs: rewrite PLAN.md and update CODEBASE.md, README.md

- Full rewrite of PLAN.md to reflect current architecture (27 REST + 3 WS endpoints,
  embedded frontend, automation, scheduler, health check, GoReleaser CI)
- Added health.go, mods.go, scheduler.go, robfig/cron dep to CODEBASE.md
- Added Gitea Actions CI/CD section to CODEBASE.md
- Added conventional commits to code style section
- Added missing API routes and embed/ to README.md

backend/internal/services/modlist_manager_test.go

@@ -0,0 +1,147 @@
+package services
+
+import (
+	"testing"
+
+	"arma3-web-server/internal/models"
+)
+
+func TestModlistManager_CreateAndGet(t *testing.T) {
+	dir := t.TempDir()
+	mm := NewModlistManager(dir)
+
+	ml, err := mm.Create("My Modlist")
+	if err != nil {
+		t.Fatalf("Create() error = %v", err)
+	}
+	if ml.Name != "My Modlist" {
+		t.Errorf("Name = %q, want %q", ml.Name, "My Modlist")
+	}
+	if ml.ID == "" {
+		t.Error("ID should not be empty")
+	}
+	if len(ml.Mods) != 0 {
+		t.Errorf("Mods should be empty, got %d", len(ml.Mods))
+	}
+
+	got, err := mm.Get(ml.ID)
+	if err != nil {
+		t.Fatalf("Get() error = %v", err)
+	}
+	if got.Name != "My Modlist" {
+		t.Errorf("Get().Name = %q, want %q", got.Name, "My Modlist")
+	}
+}
+
+func TestModlistManager_List(t *testing.T) {
+	dir := t.TempDir()
+	mm := NewModlistManager(dir)
+
+	mm.Create("List A")
+	mm.Create("List B")
+
+	items, err := mm.List()
+	if err != nil {
+		t.Fatalf("List() error = %v", err)
+	}
+	if len(items) != 2 {
+		t.Errorf("List() returned %d items, want 2", len(items))
+	}
+
+	names := map[string]bool{}
+	for _, item := range items {
+		names[item.Name] = true
+	}
+	if !names["List A"] || !names["List B"] {
+		t.Errorf("List() missing expected names: %v", names)
+	}
+}
+
+func TestModlistManager_Update(t *testing.T) {
+	dir := t.TempDir()
+	mm := NewModlistManager(dir)
+
+	ml, _ := mm.Create("Original")
+	mods := []models.ModEntry{
+		{ID: "123", Name: "CBA_A3", Enabled: true},
+		{ID: "456", Name: "ACE", Enabled: false},
+	}
+
+	updated, err := mm.Update(ml.ID, "Updated", mods)
+	if err != nil {
+		t.Fatalf("Update() error = %v", err)
+	}
+	if updated.Name != "Updated" {
+		t.Errorf("Name = %q, want %q", updated.Name, "Updated")
+	}
+	if len(updated.Mods) != 2 {
+		t.Errorf("Mods = %d, want 2", len(updated.Mods))
+	}
+
+	got, _ := mm.Get(ml.ID)
+	if got.Name != "Updated" {
+		t.Errorf("Get().Name = %q, want %q", got.Name, "Updated")
+	}
+	if got.Mods[0].ID != "123" {
+		t.Errorf("Get().Mods[0].ID = %q, want %q", got.Mods[0].ID, "123")
+	}
+}
+
+func TestModlistManager_Delete(t *testing.T) {
+	dir := t.TempDir()
+	mm := NewModlistManager(dir)
+
+	ml, _ := mm.Create("To Delete")
+	if err := mm.Delete(ml.ID); err != nil {
+		t.Fatalf("Delete() error = %v", err)
+	}
+
+	_, err := mm.Get(ml.ID)
+	if err == nil {
+		t.Error("Get() should fail after Delete()")
+	}
+}
+
+func TestModlistManager_Duplicate(t *testing.T) {
+	dir := t.TempDir()
+	mm := NewModlistManager(dir)
+
+	orig, _ := mm.Create("Original")
+	mm.Update(orig.ID, "Original", []models.ModEntry{
+		{ID: "123", Name: "CBA_A3", Enabled: true},
+	})
+
+	dup, err := mm.Duplicate(orig.ID, "Copy")
+	if err != nil {
+		t.Fatalf("Duplicate() error = %v", err)
+	}
+	if dup.Name != "Copy" {
+		t.Errorf("Name = %q, want %q", dup.Name, "Copy")
+	}
+	if dup.ID == orig.ID {
+		t.Error("Duplicate should have different ID")
+	}
+	if len(dup.Mods) != 1 {
+		t.Errorf("Mods = %d, want 1", len(dup.Mods))
+	}
+}
+
+func TestModlistManager_GetNotFound(t *testing.T) {
+	dir := t.TempDir()
+	mm := NewModlistManager(dir)
+
+	_, err := mm.Get("nonexistent-uuid")
+	if err == nil {
+		t.Error("Get() should fail for nonexistent modlist")
+	}
+}
+
+func TestModlistManager_DeleteNotFound(t *testing.T) {
+	dir := t.TempDir()
+	mm := NewModlistManager(dir)
+
+	err := mm.Delete("nonexistent-uuid")
+	if err == nil {
+		t.Error("Delete() should fail for nonexistent modlist")
+	}
+}