feat(native): add session management with global handle registry

native/craft-core/src/session.rs

@@ -0,0 +1,42 @@
+use std::collections::HashMap;
+use std::sync::Mutex;
+use once_cell::sync::Lazy;
+
+pub struct SessionState {
+    pub config_json: String,
+    pub bit_handle: Option<usize>,
+    pub application_data: Vec<u8>,
+    pub logged_in: bool,
+}
+
+pub static SESSIONS: Lazy<Mutex<HashMap<i64, SessionState>>> =
+    Lazy::new(|| Mutex::new(HashMap::new()));
+
+static NEXT_SESSION_ID: Lazy<Mutex<i64>> = Lazy::new(|| Mutex::new(1));
+
+pub fn register_session(config_json: String, application_data: Vec<u8>) -> i64 {
+    let mut next_id = NEXT_SESSION_ID.lock().unwrap();
+    let id = *next_id;
+    *next_id += 1;
+    let mut sessions = SESSIONS.lock().unwrap();
+    sessions.insert(id, SessionState {
+        config_json,
+        bit_handle: None,
+        application_data,
+        logged_in: false,
+    });
+    id
+}
+
+pub fn with_session<F, R>(session_id: i64, f: F) -> Option<R>
+where
+    F: FnOnce(&mut SessionState) -> R,
+{
+    let mut sessions = SESSIONS.lock().unwrap();
+    sessions.get_mut(&session_id).map(f)
+}
+
+pub fn remove_session(session_id: i64) {
+    let mut sessions = SESSIONS.lock().unwrap();
+    sessions.remove(&session_id);
+}