refactor: convert Komga test connection to Server Action

- Add testKomgaConnection to config.ts
- Update KomgaSettings to use Server Action
- Remove api/komga/test route

src/app/api/komga/test/route.ts

@@ -1,37 +0,0 @@
-import { NextResponse } from "next/server";
-import { TestService } from "@/lib/services/test.service";
-import { ERROR_CODES } from "@/constants/errorCodes";
-import { getErrorMessage } from "@/utils/errors";
-import type { KomgaLibrary } from "@/types/komga";
-import type { NextRequest } from "next/server";
-import logger from "@/lib/logger";
-
-export async function POST(request: NextRequest) {
-  try {
-    const { serverUrl, username, password } = await request.json();
-    const authHeader = Buffer.from(`${username}:${password}`).toString("base64");
-
-    const { libraries }: { libraries: KomgaLibrary[] } = await TestService.testConnection({
-      serverUrl,
-      authHeader,
-    });
-
-    return NextResponse.json({
-      message: `✅ Connexion réussie ! ${libraries.length} bibliothèque${
-        libraries.length > 1 ? "s" : ""
-      } trouvée${libraries.length > 1 ? "s" : ""}`,
-    });
-  } catch (error) {
-    logger.error({ err: error }, "Erreur lors du test de connexion:");
-    return NextResponse.json(
-      {
-        error: {
-          code: ERROR_CODES.KOMGA.CONNECTION_ERROR,
-          name: "Connection error",
-          message: getErrorMessage(ERROR_CODES.KOMGA.CONNECTION_ERROR),
-        },
-      },
-      { status: 400 }
-    );
-  }
-}