fix(panel): read outbound protocol ids case-insensitively everywhere (#6523)

Six more readers compared an outbound's protocol id exactly while the core
lowercases it, so an outbound spelled "Blackhole" passed every
excludeBlackhole filter (offered as an mtproto egress, a dialerProxy
target and the geodata download egress, all of which then drop the
traffic) and one spelled "Freedom" was queued by Test All Outbounds. They
now share isOutboundProtocol.

frontend/src/schemas/primitives/outbound-protocol.ts

@@ -1,3 +1,13 @@
+// xray-core lowercases a protocol id before it resolves the handler, so a
+// template pasted as "Freedom" still runs as the freedom outbound.
+export function isOutboundProtocol(
+  outbound: { protocol?: unknown } | null | undefined,
+  id: string,
+): boolean {
+  const protocol = outbound?.protocol;
+  return typeof protocol === 'string' && protocol.toLowerCase() === id;
+}
+
 export const OutboundProtocols = Object.freeze({
   Freedom: 'freedom',
   Blackhole: 'blackhole',