Initial commit: LoFlum FTP/SFTP client

Tauri 2 + Rust + Svelte 5. SFTP via ssh2, FTP via suppaftp.
Transfer queue with async worker, SQLite site storage, keychain.

src-tauri/src/transfer/queue.rs

@@ -0,0 +1,46 @@
+use std::collections::VecDeque;
+use std::sync::{Arc, Mutex};
+use crate::domain::transfer::{TransferTask, TaskState};
+
+#[derive(Clone, Default)]
+pub struct TransferQueue {
+    inner: Arc<Mutex<VecDeque<TransferTask>>>,
+}
+
+impl TransferQueue {
+    pub fn push(&self, task: TransferTask) {
+        self.inner.lock().unwrap().push_back(task);
+    }
+
+    pub fn pop(&self) -> Option<TransferTask> {
+        self.inner.lock().unwrap().pop_front()
+    }
+
+    pub fn all(&self) -> Vec<TransferTask> {
+        self.inner.lock().unwrap().iter().cloned().collect()
+    }
+
+    pub fn update_state(&self, id: &str, state: TaskState) {
+        let mut q = self.inner.lock().unwrap();
+        if let Some(t) = q.iter_mut().find(|t| t.id == id) {
+            t.state = state;
+        }
+    }
+
+    pub fn update_progress(&self, id: &str, transferred: u64, speed: u64) {
+        let mut q = self.inner.lock().unwrap();
+        if let Some(t) = q.iter_mut().find(|t| t.id == id) {
+            t.transferred_bytes = transferred;
+            t.speed = Some(speed);
+            if speed > 0 {
+                let remaining = t.total_bytes.saturating_sub(transferred);
+                t.eta_secs = Some(remaining / speed);
+            }
+        }
+    }
+
+    pub fn remove(&self, id: &str) {
+        let mut q = self.inner.lock().unwrap();
+        q.retain(|t| t.id != id);
+    }
+}