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/test/outbound-protocol-case.test.ts

@@ -0,0 +1,28 @@
+import { describe, expect, it } from 'vitest';
+
+import { isOutboundProtocol } from '@/schemas/primitives';
+
+// xray-core lowercases a protocol id in LoadWithID before it resolves the
+// handler, so every panel reader has to accept the spellings it accepts.
+describe('isOutboundProtocol', () => {
+  it.each([
+    ['canonical', { protocol: 'freedom' }],
+    ['capitalised', { protocol: 'Freedom' }],
+    ['upper', { protocol: 'FREEDOM' }],
+    ['mixed', { protocol: 'fReEdOm' }],
+  ])('matches a %s id', (_name, outbound) => {
+    expect(isOutboundProtocol(outbound, 'freedom')).toBe(true);
+  });
+
+  it.each([
+    ['another protocol', { protocol: 'blackhole' }],
+    ['another spelling of another protocol', { protocol: 'Blackhole' }],
+    ['missing', {}],
+    ['empty', { protocol: '' }],
+    ['not a string', { protocol: 42 }],
+    ['null', null],
+    ['undefined', undefined],
+  ])('rejects %s', (_name, outbound) => {
+    expect(isOutboundProtocol(outbound, 'freedom')).toBe(false);
+  });
+});