test(core): unit tests for Util/Database/Enum pure logic (+44 tests)

Adds tests for Encryption, TimeUtils, QueryHelper, AdminHelpers, ImageUtils,
StreamUtils and BootContext/ServerEnvironment enums. 242 -> 286 tests, all green.

tests/Unit/StreamUtilsTest.php

@@ -0,0 +1,22 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers StreamUtils
+ */
+final class StreamUtilsTest extends TestCase {
+
+	public function testCustomOrderPutsInputArgumentsFirst() {
+		$this->assertSame(-1, StreamUtils::customOrder('-i input.ts', 'something'));
+		$this->assertSame(1, StreamUtils::customOrder('-c:v libx264', '-i input.ts'));
+	}
+
+	public function testDetectXcVmMatchesKnownStreamPaths() {
+		$this->assertTrue(StreamUtils::detectXC_VM('http://host/live/user/123'));
+	}
+
+	public function testDetectXcVmRejectsUnrelatedPaths() {
+		$this->assertFalse(StreamUtils::detectXC_VM('http://host/dashboard'));
+	}
+}