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>

internal/geoflag/geoflag_test.go

@@ -11,6 +11,20 @@ func TestFromText(t *testing.T) {
 		{"🇺🇸 US West", "US"},
 		{"Germany Hetzner", "DE"},
 		{"unknown-node", ""},
+		// Russian country names.
+		{"Германия-1", "DE"},
+		{"Нидерланды Fast", "NL"},
+		{"Сервер Швейцария", "CH"},
+		{"США восток", "US"},
+		{"Великобритания", "GB"},
+		// City → country hints.
+		{"Frankfurt-Hetzner", "DE"},
+		{"Амстердам 2", "NL"},
+		{"node-helsinki", "FI"},
+		// Names from live Remnawave subscription (emoji comes first).
+		{"🇨🇿 Czech Republic Vless", "CZ"},
+		{"🇳🇴 Norway TR+WS", "NO"},
+		{"🇩🇪 Germany 3 HY", "DE"},
 	}
 	for _, c := range cases {
 		cc, emoji := FromText(c.in)