feat(navidrome): Musikserver-Integration (Subsonic API)

- NavidromeService mit Credential-Verwaltung (secure storage)
- Navidrome-Settings in Settings-Tab: Login/Logout für Server-Verbindung
- Dependencies hinzugefügt: http, crypto, shared_preferences, flutter_secure_storage
- Tests: 70/70 grün
- Analyzer: ✅ keine Fehler

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XJzQjUtnvYUtHdnTs3iCru

.githooks/pre-commit

@@ -0,0 +1,36 @@
+#!/bin/bash
+# Git Pre-Commit Hook: Melo App Qualitäts-Gate
+# Läuft automatisch vor jedem git commit
+
+export FLUTTER="/home/dustin/development/flutter/bin/flutter"
+export DART="/home/dustin/development/flutter/bin/dart"
+export PATH="$HOME/development/flutter/bin:$PATH"
+
+echo "🔍 Melo App Qualitäts-Gate gestartet..."
+
+# 1. Dart Analyse
+echo -n "  Prüfe: flutter analyze ... "
+cd "$(git rev-parse --show-toplevel)" || exit 1
+ANALYZE_OUTPUT=$($FLUTTER analyze 2>&1)
+if echo "$ANALYZE_OUTPUT" | grep -q "No issues found"; then
+    echo "✅"
+else
+    echo "❌ FEHLER!"
+    echo "$ANALYZE_OUTPUT" | tail -20
+    exit 1
+fi
+
+# 2. Tests
+echo -n "  Prüfe: flutter test ... "
+TEST_OUTPUT=$($FLUTTER test 2>&1)
+if echo "$TEST_OUTPUT" | grep -q "All tests passed"; then
+    echo "✅"
+elif echo "$TEST_OUTPUT" | grep -q "No tests found"; then
+    echo "⚠️  Keine Tests vorhanden (überspringe)"
+else
+    echo "❌ Tests fehlgeschlagen!"
+    echo "$TEST_OUTPUT" | tail -20
+    exit 1
+fi
+
+echo "✅ Alle Prüfungen bestanden! Commit wird freigegeben."