Release 3.9.0+3: subscription-URL routing, emoji flags, Remnawave provisioning.

Route credential-less http(s) URLs pasted into the add-link field to
subscription import (fixes remaining 'proxy URI missing username').
Extend geoflag with RU country names and city hints; live Remnawave
names already carrying emoji flags are kept as-is. Add admin
provisioning via configs/remnawave-api.json (GET by-username / POST
users, 50 GB MONTH plan) and the «Выдать доступ» UI panel.

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

configs/remnawave-api.example.json

@@ -0,0 +1,11 @@
+{
+  "panel_url": "https://panel.example.com",
+  "api_token": "PASTE_API_TOKEN_HERE",
+  "caddy_api_key": "",
+  "provision": {
+    "traffic_gb": 50,
+    "days": 30,
+    "strategy": "MONTH",
+    "hwid_device_limit": 0
+  }
+}