feat(Production): Complete production deployment infrastructure

- Add comprehensive health check system with multiple endpoints
- Add Prometheus metrics endpoint
- Add production logging configurations (5 strategies)
- Add complete deployment documentation suite:
  * QUICKSTART.md - 30-minute deployment guide
  * DEPLOYMENT_CHECKLIST.md - Printable verification checklist
  * DEPLOYMENT_WORKFLOW.md - Complete deployment lifecycle
  * PRODUCTION_DEPLOYMENT.md - Comprehensive technical reference
  * production-logging.md - Logging configuration guide
  * ANSIBLE_DEPLOYMENT.md - Infrastructure as Code automation
  * README.md - Navigation hub
  * DEPLOYMENT_SUMMARY.md - Executive summary
- Add deployment scripts and automation
- Add DEPLOYMENT_PLAN.md - Concrete plan for immediate deployment
- Update README with production-ready features

All production infrastructure is now complete and ready for deployment.

tests/Unit/Domain/PreSave/ValueObjects/StreamingPlatformTest.php

@@ -0,0 +1,105 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Domain\PreSave\ValueObjects\StreamingPlatform;
+
+describe('StreamingPlatform', function () {
+    describe('display names', function () {
+        it('returns correct display name for SPOTIFY', function () {
+            $name = StreamingPlatform::SPOTIFY->getDisplayName();
+            expect(str_contains($name, 'Spotify'))->toBeTrue();
+        });
+
+        it('returns correct display name for TIDAL', function () {
+            $name = StreamingPlatform::TIDAL->getDisplayName();
+            expect(str_contains($name, 'Tidal'))->toBeTrue();
+        });
+
+        it('returns correct display name for APPLE_MUSIC', function () {
+            $name = StreamingPlatform::APPLE_MUSIC->getDisplayName();
+            expect(str_contains($name, 'Apple Music'))->toBeTrue();
+        });
+
+        it('returns correct display name for DEEZER', function () {
+            $name = StreamingPlatform::DEEZER->getDisplayName();
+            expect(str_contains($name, 'Deezer'))->toBeTrue();
+        });
+
+        it('returns correct display name for YOUTUBE_MUSIC', function () {
+            $name = StreamingPlatform::YOUTUBE_MUSIC->getDisplayName();
+            expect(str_contains($name, 'YouTube Music'))->toBeTrue();
+        });
+    });
+
+    describe('OAuth provider mapping', function () {
+        it('returns OAuth provider name matching enum value', function () {
+            expect(str_contains(StreamingPlatform::SPOTIFY->getOAuthProvider(), 'spotify'))->toBeTrue();
+            expect(str_contains(StreamingPlatform::TIDAL->getOAuthProvider(), 'tidal'))->toBeTrue();
+            expect(str_contains(StreamingPlatform::APPLE_MUSIC->getOAuthProvider(), 'apple_music'))->toBeTrue();
+        });
+    });
+
+    describe('platform support status', function () {
+        it('identifies SPOTIFY as supported', function () {
+            expect(StreamingPlatform::SPOTIFY->isSupported())->toBeTrue();
+        });
+
+        it('identifies TIDAL as not yet supported', function () {
+            expect(StreamingPlatform::TIDAL->isSupported())->toBeFalse();
+        });
+
+        it('identifies APPLE_MUSIC as not yet supported', function () {
+            expect(StreamingPlatform::APPLE_MUSIC->isSupported())->toBeFalse();
+        });
+
+        it('identifies DEEZER as not yet supported', function () {
+            expect(StreamingPlatform::DEEZER->isSupported())->toBeFalse();
+        });
+
+        it('identifies YOUTUBE_MUSIC as not yet supported', function () {
+            expect(StreamingPlatform::YOUTUBE_MUSIC->isSupported())->toBeFalse();
+        });
+    });
+
+    describe('supported platforms list', function () {
+        it('returns only supported platforms', function () {
+            $supported = StreamingPlatform::supported();
+
+            $supportedCount = 0;
+            foreach ($supported as $platform) {
+                if ($platform === StreamingPlatform::SPOTIFY) {
+                    $supportedCount++;
+                }
+            }
+
+            expect($supportedCount)->toBeGreaterThan(0);
+        });
+
+        it('filters out unsupported platforms', function () {
+            $supported = StreamingPlatform::supported();
+
+            $hasUnsupported = false;
+            foreach ($supported as $platform) {
+                if (!$platform->isSupported()) {
+                    $hasUnsupported = true;
+                }
+            }
+
+            expect($hasUnsupported)->toBeFalse();
+        });
+    });
+
+    describe('enum cases', function () {
+        it('has all expected platform cases', function () {
+            $cases = StreamingPlatform::cases();
+            $caseValues = array_map(fn($case) => $case->value, $cases);
+
+            expect(in_array('spotify', $caseValues))->toBeTrue();
+            expect(in_array('tidal', $caseValues))->toBeTrue();
+            expect(in_array('apple_music', $caseValues))->toBeTrue();
+            expect(in_array('deezer', $caseValues))->toBeTrue();
+            expect(in_array('youtube_music', $caseValues))->toBeTrue();
+        });
+    });
+});