fix(pl24): prefix basePath for relative P4 hrefs in fetchP4Page

Volvo vin-group.action categories store hrefs relative to the catalog dir
(e.g. "vin-group.action?group1=…"). fetchP4Page did `${baseUrl}${url}`,
collapsing to "partslink24.comvin-group.action" → ENOTFOUND. Prefix the
service basePath when the path is relative. Fixes Volvo subgroup drilling
for existing (relative) stored linkPaths without a re-decode.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/api/src/integrations/pl24/pl24-ford-legacy.service.ts

@@ -3157,7 +3157,15 @@ export class PL24FordLegacyService {
     isFullUrl = false,
     account: "tr" | "de" = "tr",
   ): Promise<string | null> {
-    const fullUrl = isFullUrl ? url : `${this.baseUrl}${url}`;
+    // Some catalogs (Volvo vin-group.action) store hrefs relative to the catalog
+    // directory (e.g. "vin-group.action?group1=…"). Prefix the service basePath
+    // so `${baseUrl}${path}` doesn't collapse into "partslink24.comvin-group…".
+    let path = url;
+    if (!isFullUrl && !path.startsWith("/")) {
+      const cfg = getServiceConfig(serviceName);
+      if (cfg) path = `${cfg.basePath}/${serviceName}/${path}`;
+    }
+    const fullUrl = isFullUrl ? url : `${this.baseUrl}${path}`;
     const headers = await this.authService.buildFordLegacyHeadersForAccount(serviceName, account);
     const dispatcher = await this.authService.getProxyAgent4Account(account);