refactor: server no longer runs agent loop or LLM

- Remove agent_loop from server (was ~400 lines) — server dispatches to workers
- AgentManager simplified to pure dispatcher (send_event → worker)
- Remove LLM config requirement from server (workers bring their own via config.yaml)
- Remove process_feedback, build_feedback_tools from server
- Remove chat API endpoint (LLM on workers only)
- Remove service proxy (services run on workers)
- Worker reads LLM config from its own config.yaml
- ws_worker.rs handles WorkerToServer::Update messages (DB + broadcast)
- Verified locally: tori server + tori worker connect and register

src/api/chat.rs

@@ -1,53 +1,20 @@
 use std::sync::Arc;
 use axum::{
-    extract::State,
     http::StatusCode,
     response::{IntoResponse, Response},
     routing::post,
     Json, Router,
 };
-use serde::Deserialize;
 
-use crate::llm::{ChatMessage, LlmClient};
 use crate::AppState;
 
-#[derive(Deserialize)]
-struct ChatRequest {
-    messages: Vec<SimpleChatMessage>,
-}
-
-#[derive(Deserialize)]
-struct SimpleChatMessage {
-    role: String,
-    content: String,
-}
-
 pub fn router(state: Arc<AppState>) -> Router {
     Router::new()
         .route("/chat", post(chat))
         .with_state(state)
 }
 
-async fn chat(
-    State(state): State<Arc<AppState>>,
-    Json(input): Json<ChatRequest>,
-) -> Result<Json<serde_json::Value>, Response> {
-    let llm = LlmClient::new(&state.config.llm);
-    let messages: Vec<ChatMessage> = input
-        .messages
-        .into_iter()
-        .map(|m| ChatMessage {
-            role: m.role,
-            content: Some(m.content),
-            tool_calls: None,
-            tool_call_id: None,
-        })
-        .collect();
-
-    let reply = llm.chat(messages).await.map_err(|e| {
-        tracing::error!("Chat LLM error: {}", e);
-        (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()).into_response()
-    })?;
-
-    Ok(Json(serde_json::json!({ "reply": reply })))
+async fn chat() -> Result<Json<serde_json::Value>, Response> {
+    // Chat endpoint removed — LLM runs on workers only
+    Err((StatusCode::GONE, "Chat endpoint removed. LLM runs on workers.").into_response())
 }