Feat: add vault module

vault/tests/mock_store.rs

@@ -0,0 +1,35 @@
+//! In-memory mock key-value store for testing vault logic (native only)
+use kvstore::KVStore;
+use std::collections::HashMap;
+use std::sync::{Arc, Mutex};
+
+#[derive(Clone, Default)]
+pub struct MockStore {
+    inner: Arc<Mutex<HashMap<String, Vec<u8>>>>,
+}
+
+#[cfg_attr(target_arch = "wasm32", async_trait::async_trait(?Send))]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait::async_trait)]
+impl KVStore for MockStore {
+    async fn get(&self, key: &str) -> Result<Option<Vec<u8>>, kvstore::KVError> {
+        Ok(self.inner.lock().unwrap().get(key).cloned())
+    }
+    async fn set(&self, key: &str, value: &[u8]) -> Result<(), kvstore::KVError> {
+        self.inner.lock().unwrap().insert(key.to_string(), value.to_vec());
+        Ok(())
+    }
+    async fn remove(&self, key: &str) -> Result<(), kvstore::KVError> {
+        self.inner.lock().unwrap().remove(key);
+        Ok(())
+    }
+    async fn contains_key(&self, key: &str) -> Result<bool, kvstore::KVError> {
+        Ok(self.inner.lock().unwrap().contains_key(key))
+    }
+    async fn keys(&self) -> Result<Vec<String>, kvstore::KVError> {
+        Ok(self.inner.lock().unwrap().keys().cloned().collect())
+    }
+    async fn clear(&self) -> Result<(), kvstore::KVError> {
+        self.inner.lock().unwrap().clear();
+        Ok(())
+    }
+}