Refactor: Server-Settings von appsettings.json in DB-Tabelle (server_settings)

- Neuer ServerSettingsService: zentrale Settings in SQLite mit In-Memory-Cache
- Auto-Migration: bestehende appsettings.Production.json wird einmalig in DB übernommen
- Alle Services umgestellt: IConfiguration → ServerSettingsService (dynamisch, kein Neustart)
- Port bleibt als einziges Setting in appsettings.Production.json (erfordert Neustart)
- ServerSettingsEndpoint: liest/schreibt DB statt JSON-Datei, Port als Sonder-Setting
- IConfiguration komplett entfernt aus allen Services (ChatService, ToolService, AnthropicService,
  OpenAiService, KreaService, TelegramService, KeyScannerService, GitHubEventScannerService)
- AuthMiddleware: KreaApiKey dynamisch aus DB
- appsettings.json bereinigt: nur noch Port und Logging
- Dokumentation aktualisiert (ARCHITECTURE.md, ARCHITECTURE_QUICK.md, README.md)

Services/KeyScannerService.cs

@@ -9,7 +9,6 @@ using System.Text.RegularExpressions;
 using System.Threading;
 using System.Threading.Tasks;
 using Gott.Models;
-using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 
@@ -20,9 +19,11 @@ public class KeyScannerService : BackgroundService
     private readonly DatabaseService _db;
     private readonly IHttpClientFactory _httpFactory;
     private readonly ILogger<KeyScannerService> _logger;
-    private readonly string _githubToken;
-    private readonly string _serperApiKey;
-    private readonly int _intervalHours;
+    private readonly ServerSettingsService _settings;
+
+    private string _githubToken => _settings.Get("GitHubToken");
+    private string _serperApiKey => _settings.Get("SerperApiKey");
+    private int _intervalHours => _settings.GetInt("ScanIntervalHours", 0);
 
     // Status-Tracking
     private readonly object _lock = new();
@@ -75,15 +76,13 @@ public class KeyScannerService : BackgroundService
     public KeyScannerService(
         DatabaseService db,
         IHttpClientFactory httpFactory,
-        IConfiguration config,
+        ServerSettingsService settings,
         ILogger<KeyScannerService> logger)
     {
         _db = db;
         _httpFactory = httpFactory;
+        _settings = settings;
         _logger = logger;
-        _githubToken = config["GitHubToken"] ?? "";
-        _serperApiKey = config["SerperApiKey"] ?? "";
-        _intervalHours = config.GetValue<int>("ScanIntervalHours", 0);
     }
 
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
@@ -163,7 +162,6 @@ public class KeyScannerService : BackgroundService
         var modeLabel = modeLabels.ContainsKey(mode) ? modeLabels[mode] : "Full";
         AddLog("scan", modeLabel + "-Scan gestartet");
         var newKeysFound = 0;
-        var checkedCount = 0;
         var totalFound = 0;
 
         try
@@ -230,21 +228,10 @@ public class KeyScannerService : BackgroundService
             }
             AddLog("scan", newKeysFound + " neue Key(s) gespeichert");
 
-            // Phase 3: Alle unchecked Keys prüfen
-            var allScanned = (await _db.GetScannedKeys()).ToList();
-            var toCheck = allScanned.Where(k => k.Status == "unchecked").ToList();
-            foreach (var sk in toCheck)
-            {
-                ct.ThrowIfCancellationRequested();
-                await CheckAndUpdateKey(sk);
-                checkedCount++;
-                await Task.Delay(500, ct); // Rate-Limit schonen
-            }
-
             lock (_lock)
             {
                 _lastRun = DateTime.UtcNow.ToString("o");
-                _lastResult = $"{modeLabel}: {totalFound} gefunden, {newKeysFound} neu, {checkedCount} geprüft";
+                _lastResult = $"{modeLabel}: {totalFound} gefunden, {newKeysFound} neu";
             }
 
             AddLog("scan", "Scan abgeschlossen – " + _lastResult);