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_thread.rs

@@ -0,0 +1,60 @@
+//! Thread metadata — maps to `message_thread` table.
+//!
+//! A thread is anchored by a root message. Reply messages in the same thread
+//! set `message.thread_id = message_thread.id`.
+
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+/// A message thread anchored by a root message.
+///
+/// Maps to the `message_thread` table. Reply messages set
+/// `message.thread_id = message_thread.id` to join the thread.
+#[derive(Debug, Clone, Serialize, Deserialize, sqlx::FromRow)]
+pub struct MessageThread {
+    pub id: Uuid,
+    pub channel_id: Uuid,
+    /// The first message that started this thread.
+    pub root_message_id: Uuid,
+    pub created_by: Uuid,
+    pub replies_count: i64,
+    pub participants_count: i64,
+    pub last_reply_message_id: Option<Uuid>,
+    pub last_reply_at: Option<DateTime<Utc>>,
+    /// Forum-style: mark thread as resolved / answered.
+    pub resolved: bool,
+    pub resolved_by: Option<Uuid>,
+    pub resolved_at: Option<DateTime<Utc>>,
+    pub created_at: DateTime<Utc>,
+    pub updated_at: DateTime<Utc>,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_thread_serialize() {
+        let thread = MessageThread {
+            id: Uuid::now_v7(),
+            channel_id: Uuid::now_v7(),
+            root_message_id: Uuid::now_v7(),
+            created_by: Uuid::now_v7(),
+            replies_count: 5,
+            participants_count: 3,
+            last_reply_message_id: None,
+            last_reply_at: None,
+            resolved: false,
+            resolved_by: None,
+            resolved_at: None,
+            created_at: Utc::now(),
+            updated_at: Utc::now(),
+        };
+
+        let json = serde_json::to_value(&thread).unwrap();
+        assert_eq!(json["replies_count"], 5);
+        assert_eq!(json["resolved"], false);
+        assert!(json["id"].is_string());
+    }
+}