fix: enable vision support for llamacpp provider (#3907)

The llamacpp provider was instantiated with vision disabled by default, causing image transfers from Telegram to fail. Use new_with_vision() with vision enabled, matching the behavior of other compatible providers.

Fixes #3802

src/providers/mod.rs

@@ -1320,11 +1320,12 @@ fn create_provider_with_url_and_options(
                 .map(str::trim)
                 .filter(|value| !value.is_empty())
                 .unwrap_or("llama.cpp");
-            Ok(compat(OpenAiCompatibleProvider::new(
+            Ok(compat(OpenAiCompatibleProvider::new_with_vision(
                 "llama.cpp",
                 base_url,
                 Some(llama_cpp_key),
                 AuthStyle::Bearer,
+                true,
             )))
         }
         "sglang" => {