fix(frontend): Interceptor normalisiert ALLE apiClient-URLs — auch Direktaufrufe und Cache-Alte-Chunks

Der apiX-Wrapper-Fix (744f2a1) heilte nur Wrapper-Aufrufe. Produktion-Logs
zeigten: POST /api/v1/api/v1/ai-proactive/context → 405 (4x vom User-
Browser mit alten gecachten Chunks). Der Request-Interceptor strippt jetzt
redundante /api/v1-Präfixe auf Transport-Ebene — heilt auch Direkt-
apiClient-Calls und stale Cache-Artefakte transparent.

frontend/src/api/client.ts

@@ -47,6 +47,16 @@ export function setValidationErrorHandler(handler: (errors: Record<string, strin
 
 apiClient.interceptors.request.use(
   (config: InternalAxiosRequestConfig) => {
+    // Normalize URLs: strip a redundant leading '/api/v1' when it collides
+    // with the axios baseURL '/api/v1' (double-prefix → 404/405). Done here
+    // in the interceptor (not only in the apiX wrappers) so DIRECT apiClient
+    // calls are covered too — stale browser-cache chunks keep calling with
+    // full prefixes after deploys and this heals them transparently.
+    if (typeof config.url === 'string' && config.url.startsWith('/api/v1/')) {
+      config.url = config.url.slice('/api/v1'.length);
+    } else if (config.url === '/api/v1') {
+      config.url = '/';
+    }
     // Attach CSRF token on unsafe methods
     const unsafe = ['post', 'put', 'patch', 'delete'];
     if (unsafe.includes(config.method?.toLowerCase() ?? '') && csrfToken) {