feat: add tenant and user management with migrations, handlers, and tests

- Implemented tenant and user management features including:
  - Tenant creation and management with associated migrations.
  - User creation and management with associated migrations.
  - Tenant membership management with associated migrations.
  - Platform user roles management with associated migrations.
  - Quota management with associated migrations.
  - Article and template management with associated migrations.
- Added HTTP handlers for templates and workspaces.
- Created tests for protected and public routes.
- Introduced a script to check tenant scope in SQL queries.
- Documented task plan for backend completion and frontend foundation.

server/internal/tenant/domain/brand_question.go

@@ -0,0 +1,23 @@
+package domain
+
+import "time"
+
+type BrandQuestion struct {
+	ID               int64
+	TenantID         int64
+	BrandID          int64
+	KeywordID        int64
+	CurrentVersionID *int64
+	Status           string
+	CreatedAt        time.Time
+}
+
+type BrandQuestionVersion struct {
+	ID           int64
+	QuestionID   int64
+	QuestionText string
+	QuestionHash string
+	VersionNo    int
+	IsActive     bool
+	CreatedAt    time.Time
+}