feat: Replace int IDs with ulid.ULID in domain entities and update TypeScript DTOs

backend/internal/domain/entities/activity.go

@@ -1,7 +1,9 @@
 package entities
 
+import "github.com/oklog/ulid/v2"
+
 type Activity struct {
-	ID          int
+	ID          ulid.ULID
 	Name        string
 	BillingRate float64
 }

backend/internal/domain/entities/company.go

@@ -1,6 +1,8 @@
 package entities
 
+import "github.com/oklog/ulid/v2"
+
 type Company struct {
-	ID   int
+	ID   ulid.ULID
 	Name string
 }

backend/internal/domain/entities/customer.go

@@ -1,7 +1,9 @@
 package entities
 
+import "github.com/oklog/ulid/v2"
+
 type Customer struct {
-	ID        int
+	ID        ulid.ULID
 	Name      string
 	CompanyID int
 }

backend/internal/domain/entities/project.go

@@ -1,7 +1,9 @@
 package entities
 
+import "github.com/oklog/ulid/v2"
+
 type Project struct {
-	ID         int
+	ID         ulid.ULID
 	Name       string
 	CustomerID int
 }

backend/internal/domain/entities/timeentry.go

@@ -1,9 +1,13 @@
 package entities
 
-import "time"
+import (
+	"time"
+
+	"github.com/oklog/ulid/v2"
+)
 
 type TimeEntry struct {
-	ID          int
+	ID          ulid.ULID
 	UserID      int
 	ProjectID   int
 	ActivityID  int

backend/internal/domain/entities/user.go

@@ -1,7 +1,9 @@
 package entities
 
+import "github.com/oklog/ulid/v2"
+
 type User struct {
-	ID         int
+	ID         ulid.ULID
 	Username   string
 	Password   string
 	Role       string