refactor(core): remove provider module, migrate to LLMProvider, add client mode handling, improve serialization error handling, update workspace edition, and clean up conditionals and imports

examples/mcp_chat.rs

@@ -8,9 +8,9 @@
 //! - Ensure Ollama is running with a model available
 
 use owlen_core::{
+    Provider,
     mcp::remote_client::RemoteMcpClient,
     types::{ChatParameters, ChatRequest, Message, Role},
-    Provider,
 };
 use std::sync::Arc;
 
@@ -57,7 +57,7 @@ async fn main() -> Result<(), anyhow::Error> {
 
     // Send request and get response
     println!("\nAssistant: ");
-    let response = client.chat(request).await?;
+    let response = client.send_prompt(request).await?;
     println!("{}", response.message.content);
 
     if let Some(usage) = response.usage {