feat: add JsSIP SIP client and useSipPhone hook for Ozonetel softphone integration

src/types/sip.ts

@@ -0,0 +1,11 @@
+export type SIPConfig = {
+    displayName: string;
+    uri: string;
+    password: string;
+    wsServer: string;
+    stunServers: string;
+};
+
+export type ConnectionStatus = 'disconnected' | 'connecting' | 'connected' | 'registered' | 'error';
+
+export type CallState = 'idle' | 'ringing-in' | 'ringing-out' | 'active' | 'ended' | 'failed';