refactor(tests): reformat code and update dependency management

- Reorganized import statements in adapter tests for better readability
- Replaced or_insert_with(Vec::new) with or_default() in test closures
- Updated Cargo.lock with new dependency versions and checksums
- Added TLS features to tonic dependency configuration
- Included sqlx, chrono, and uuid dependencies with specific features
- Added jsonwebtoken and arc-swap as project dependencies
- Reformatted assertion statements to comply with line length limits
- Adjusted base64 import order in engine codec module
- Updated protobuf include statement formatting

models/message_bookmark.rs

@@ -0,0 +1,46 @@
+//! User bookmark on a message — maps to `message_bookmark` table.
+//!
+//! Similar to browser bookmarks: user saves a message for later reference,
+//! optionally with a personal note.
+
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+/// A user bookmark on a message for later reference.
+///
+/// Maps to the `message_bookmark` table. Similar to browser bookmarks,
+/// optionally with a personal note.
+#[derive(Debug, Clone, Serialize, Deserialize, sqlx::FromRow)]
+pub struct MessageBookmark {
+    pub id: Uuid,
+    pub message_id: Uuid,
+    pub channel_id: Uuid,
+    pub user_id: Uuid,
+    /// Personal note the user attached to this bookmark.
+    pub note: Option<String>,
+    pub created_at: DateTime<Utc>,
+    pub updated_at: DateTime<Utc>,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_bookmark_serialize() {
+        let bm = MessageBookmark {
+            id: Uuid::now_v7(),
+            message_id: Uuid::now_v7(),
+            channel_id: Uuid::now_v7(),
+            user_id: Uuid::now_v7(),
+            note: Some("Important reference".into()),
+            created_at: Utc::now(),
+            updated_at: Utc::now(),
+        };
+
+        let json = serde_json::to_value(&bm).unwrap();
+        assert_eq!(json["note"], "Important reference");
+        assert!(json["message_id"].is_string());
+    }
+}