feat: implement HyperliquidMonitor for position opening and migrate dependencies to git repository urls

src/structs.rs

@@ -1,6 +1,10 @@
-/// Shared message structure across modules.
+/// Represents a detected position opening event on Hyperliquid.
 #[derive(Debug, Clone)]
-pub struct SharedMessage {
-    pub id: u64,
-    pub content: String,
+pub struct PositionOpenEvent {
+    pub coin: String,
+    pub side: String, // "B" (Buy) or "S" (Sell)
+    pub px: String,   // Price as string
+    pub sz: String,   // Size as string
+    pub time: u64,    // Epoch timestamp in milliseconds
+    pub tid: u64,     // Unique trade/fill ID
 }