Release 2.7.3.1: harden proxy recovery, updates and local API.

Restore orphaned system proxy after crash, require update SHA-256, add macOS /api auth token, fix UDP ping false positives, HTTPS-only subscriptions, and keep the UI responsive during connect.

Co-authored-by: Cursor <cursoragent@cursor.com>

versioninfo.json

@@ -1,17 +1,7 @@
 {
   "FixedFileInfo": {
-    "FileVersion": {
-      "Major": 2,
-      "Minor": 7,
-      "Patch": 2,
-      "Build": 2
-    },
-    "ProductVersion": {
-      "Major": 2,
-      "Minor": 7,
-      "Patch": 2,
-      "Build": 2
-    },
+    "FileVersion": { "Major": 2, "Minor": 7, "Patch": 3, "Build": 1 },
+    "ProductVersion": { "Major": 2, "Minor": 7, "Patch": 3, "Build": 1 },
     "FileFlagsMask": "3f",
     "FileFlags": "00",
     "FileOS": "40004",
@@ -21,12 +11,12 @@
   "StringFileInfo": {
     "CompanyName": "EvilFox",
     "FileDescription": "Navis 2 — VPN client (Naive / Hy2 / AWG / VLESS / VMess / Trojan)",
-    "FileVersion": "2.7.2.2",
+    "FileVersion": "2.7.3.1",
     "InternalName": "Navis",
     "LegalCopyright": "Copyright (c) EvilFox",
     "OriginalFilename": "Navis.exe",
     "ProductName": "Navis",
-    "ProductVersion": "2.7.2.2",
+    "ProductVersion": "2.7.3.1",
     "Comments": "Open-source VPN/proxy client. https://evilfox.win/"
   },
   "VarFileInfo": {