FreshRSS

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Rasmus 814d8ccdb3 Fix greader JSON encoding on malformed UTF-8 (#8697 )

### Motivation
- The GReader API enabled `JSON_THROW_ON_ERROR` globally and streams items with `json_encode()` without catching `JsonException`, so malformed UTF-8 in feed-derived fields could trigger an uncaught exception and abort streaming responses (resulting in 500/partial responses). 

### Description
- Add `JSON_INVALID_UTF8_SUBSTITUTE` to `JSON_OPTIONS` in `p/api/greader.php` so `json_encode()` substitutes invalid UTF-8 bytes instead of failing while keeping `JSON_THROW_ON_ERROR` and other flags unchanged. 

### Testing
- Ran a syntax check with `php -l p/api/greader.php`, which completed successfully.

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[Codex Task](https://chatgpt.com/codex/cloud/tasks/task_e_69b8831ec0c48324810ea9ec05c16493)

2026-04-16 16:03:39 +02:00