fix: adopted_api_key_id konsistent als string key_id statt numerischer rowid

- CreateApiKey() gibt jetzt string key_id zurück statt long rowid
- SetScannedKeyAdopted() erwartet string statt long
- DeleteApiKey() direkter Vergleich statt Subquery
- DB-Explorer: PageSize Default auf 1000 erhöht

Services/DatabaseService.Integrations.cs

@@ -367,14 +367,14 @@ public partial class DatabaseService
     }
 
 
-    public async Task<long> CreateApiKey(ApiKeyRecord record)
+    public async Task<string> CreateApiKey(ApiKeyRecord record)
     {
         using var conn = CreateConnection();
         await conn.ExecuteAsync(@"
             INSERT INTO api_keys (key_id, provider, name, api_key, is_public, status, plan, usage_7d, usage_5h, checked_at, source_url, created_at, updated_at)
             VALUES (@KeyId, @Provider, @Name, @ApiKey, @IsPublic, @Status, @Plan, @Usage7d, @Usage5h, @CheckedAt, @SourceUrl, @CreatedAt, @UpdatedAt)",
             record);
-        return await conn.ExecuteScalarAsync<long>("SELECT last_insert_rowid()");
+        return record.KeyId;
     }
 
     public async Task UpdateApiKey(string keyId, string name, string apiKey = null)
@@ -425,7 +425,7 @@ public partial class DatabaseService
         using var conn = CreateConnection();
         // Scanned-Keys die auf diesen API-Key verweisen zurücksetzen
         await conn.ExecuteAsync(
-            "UPDATE scanned_keys SET adopted_api_key_id = NULL WHERE adopted_api_key_id = (SELECT id FROM api_keys WHERE key_id = @keyId)",
+            "UPDATE scanned_keys SET adopted_api_key_id = NULL WHERE adopted_api_key_id = @keyId",
             new { keyId });
         // User die diesen Key ausgewählt haben zurücksetzen
         await conn.ExecuteAsync(
@@ -505,7 +505,7 @@ public partial class DatabaseService
             new { scannedKeyId });
     }
 
-    public async Task SetScannedKeyAdopted(string scannedKeyId, long apiKeyId)
+    public async Task SetScannedKeyAdopted(string scannedKeyId, string apiKeyId)
     {
         using var conn = CreateConnection();
         await conn.ExecuteAsync(