feat(server): refactor handlers, router, state management, and memory tools

server/src/db.rs

@@ -8,7 +8,10 @@ pub fn init_redb(base: &Path) -> Arc<Database> {
     let db = match redb::Database::create(&redb_path) {
         Ok(db) => Arc::new(db),
         Err(e) => {
-            let err_msg = format!("CRITICAL FATAL ERROR: Failed to open or create redb database at {:?}. Error: {}. This almost always means another instance of mcp-memory-server is already running and holds the exclusive file lock on the database.", redb_path, e);
+            let err_msg = format!(
+                "CRITICAL FATAL ERROR: Failed to open or create redb database at {:?}. Error: {}. This almost always means another instance of mcp-memory-server is already running and holds the exclusive file lock on the database.",
+                redb_path, e
+            );
             eprintln!("{}", err_msg);
             tracing::error!("{}", err_msg);
             std::process::exit(1);