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

package.json

@@ -21,6 +21,7 @@
         "@untitledui/file-icons": "^0.0.8",
         "@untitledui/icons": "^0.0.21",
         "input-otp": "^1.4.2",
+        "jssip": "^3.13.6",
         "motion": "^12.29.0",
         "qr-code-styling": "^1.9.2",
         "react": "^19.2.3",
@@ -38,6 +39,7 @@
     "devDependencies": {
         "@tailwindcss/postcss": "^4.1.18",
         "@trivago/prettier-plugin-sort-imports": "^5.2.2",
+        "@types/jssip": "^3.5.3",
         "@types/node": "^24.10.9",
         "@types/react": "^19.2.9",
         "@types/react-dom": "^19.2.3",