feat(template-askama): add Askama template adapter for diary entries

crates/presentation/src/lib.rs

@@ -0,0 +1 @@
+pub mod ports;

crates/presentation/src/ports.rs

@@ -0,0 +1,5 @@
+use domain::models::{DiaryEntry, collections::Paginated};
+
+pub trait HtmlRenderer: Send + Sync {
+    fn render_diary_page(&self, data: &Paginated<DiaryEntry>) -> Result<String, String>;
+}