Fix code quality: trailing whitespace, unused imports, clippy warnings

- Fix trailing whitespace in kex.rs and s3.rs
- Add missing KexProposal import in kex_complete.rs
- Auto-fix clippy warnings across all crates
- All 153 tests pass

filetree/src/lib.rs

@@ -630,28 +630,28 @@ mod tests {
     }
 }
 
-    // 新增：创建虚拟树类型
-    pub fn create_tree_type(
-        conn: &Connection,
-        tree_type: &str,
-        tree_name: &str,
-        description: &str,
-        is_system_defined: bool,
-    ) -> Result<()> {
-        conn.execute(
-            "INSERT INTO tree_registry (tree_type, tree_name, description, is_system_defined)
+// 新增：创建虚拟树类型
+pub fn create_tree_type(
+    conn: &Connection,
+    tree_type: &str,
+    tree_name: &str,
+    description: &str,
+    is_system_defined: bool,
+) -> Result<()> {
+    conn.execute(
+        "INSERT INTO tree_registry (tree_type, tree_name, description, is_system_defined)
              VALUES (?1, ?2, ?3, ?4)",
-            rusqlite::params![tree_type, tree_name, description, is_system_defined as i64],
-        )?;
-        Ok(())
-    }
+        rusqlite::params![tree_type, tree_name, description, is_system_defined as i64],
+    )?;
+    Ok(())
+}
 
-    // 新增：获取所有虚拟树类型
-    // 新增：删除虚拟树类型（仅限用户自定义）
-    pub fn delete_tree_type(conn: &Connection, tree_type: &str) -> Result<()> {
-        conn.execute(
-            "DELETE FROM tree_registry WHERE tree_type = ?1 AND is_system_defined = 0",
-            [tree_type],
-        )?;
-        Ok(())
-    }
+// 新增：获取所有虚拟树类型
+// 新增：删除虚拟树类型（仅限用户自定义）
+pub fn delete_tree_type(conn: &Connection, tree_type: &str) -> Result<()> {
+    conn.execute(
+        "DELETE FROM tree_registry WHERE tree_type = ?1 AND is_system_defined = 0",
+        [tree_type],
+    )?;
+    Ok(())
+}