Add Accept+XHR headers and raw-string response parsing for token endpoint

Shipped: April 26, 2026 at 2:49 AM UTC
Author: Kamo
Commit: 7cbfc82

FreePBX was returning text/html when called via cluster DNS because the Host header didn't match the configured PBX_HOSTNAME. Adding Accept: application/json and X-Requested-With: XMLHttpRequest tells FreePBX to return JSON errors instead of redirecting to an HTML page. Switched from ResponseEntity<JsonNode> to ResponseEntity<String> with manual objectMapper.readTree() so non-JSON responses produce a clear diagnostic log line instead of an opaque HttpMessageConverter exception.

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