feat(dimentorin): materials module (CRUD konten mentoring, public+protected routes)

- app_materials table: mentor_id, title, slug, category, description, content
- domain/application/infrastructure pola articles: repo postgres, service, DTO ZodValidate
- routes: GET /materials (public, published only), GET /materials/{id|slug|categories}, POST/PUT/DELETE (auth, author-only)
- verified e2e: create 3 materi sebagai mentor, list, slug, categories

imphnen-dimentorin/src/materials/domain/repository.rs

@@ -0,0 +1,23 @@
+use async_trait::async_trait;
+use paginator_utils::PaginatorResponse;
+use uuid::Uuid;
+
+use super::material::MaterialEntity;
+use imphnen_utils::AppError;
+
+#[async_trait]
+pub trait MaterialRepository: Send + Sync {
+	async fn find_all_paginated(
+		&self,
+		page: u64,
+		per_page: u64,
+		category: Option<String>,
+		published_only: bool,
+	) -> Result<PaginatorResponse<MaterialEntity>, AppError>;
+	async fn find_by_id(&self, id: Uuid) -> Result<MaterialEntity, AppError>;
+	async fn find_by_slug(&self, slug: &str) -> Result<MaterialEntity, AppError>;
+	async fn find_categories(&self) -> Result<Vec<String>, AppError>;
+	async fn create(&self, entity: MaterialEntity) -> Result<Uuid, AppError>;
+	async fn update(&self, id: Uuid, entity: MaterialEntity) -> Result<(), AppError>;
+	async fn delete(&self, id: Uuid) -> Result<(), AppError>;
+}