feat: move core services to services directory

src/services/types.rs

@@ -0,0 +1,22 @@
+use crate::db::{Item, Meta, Tag};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ItemWithMeta {
+    pub item: Item,
+    pub tags: Vec<Tag>,
+    pub meta: Vec<Meta>,
+}
+
+impl ItemWithMeta {
+    pub fn meta_as_map(&self) -> HashMap<String, String> {
+        self.meta.iter().cloned().map(|m| (m.name, m.value)).collect()
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ItemWithContent {
+    pub item_with_meta: ItemWithMeta,
+    pub content: Vec<u8>,
+}