revert: remove chart generation (plotters approach dropped)

Chart image via plotters looked bad and TradingView webhook
can't send chart screenshots programmatically. Reverted to
text-only Telegram notifications.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/bin/sim.rs

@@ -9,42 +9,33 @@ async fn main() -> Result<()> {
     dotenvy::dotenv().ok();
     tracing_subscriber::fmt().with_max_level(tracing::Level::INFO).init();
 
-    let token   = std::env::var("TELEGRAM_BOT_TOKEN").expect("TELEGRAM_BOT_TOKEN");
+    let token     = std::env::var("TELEGRAM_BOT_TOKEN").expect("TELEGRAM_BOT_TOKEN");
-    let chat_id = std::env::var("TELEGRAM_CHAT_ID").expect("TELEGRAM_CHAT_ID").parse::<i64>()?;
+    let chat_id   = std::env::var("TELEGRAM_CHAT_ID").expect("TELEGRAM_CHAT_ID").parse::<i64>()?;
     let thread_id = std::env::var("TELEGRAM_THREAD_ID").ok().and_then(|s| s.parse::<i64>().ok());
 
     let tg   = TelegramConfig { token, chat_id, thread_id };
     let http = Client::new();
 
-    // ── 1. Pending order placed ───────────────────────────────────────────────
+    // 1. Pending
     tracing::info!("step 1: PENDING");
     let msg_id = tg.send(&http,
         "🟡 <b>PENDING</b>\nXAUUSDm Long\nEntry: 3325.50\nSL: 3320.00   TP: 3333.75\nVol: 0.03 lot   RR: 1.5",
     ).await?;
     tracing::info!(msg_id, "sent");
-
     sleep(Duration::from_secs(3)).await;
 
-    // ── 2. Limit order triggered / filled ────────────────────────────────────
+    // 2. Filled
     tracing::info!("step 2: FILLED");
     tg.edit(&http, msg_id,
         "⚡ <b>FILLED</b>\nXAUUSDm Long\nEntry: 3325.50\nSL: 3320.00   TP: 3333.75\nVol: 0.03 lot",
     ).await?;
-    tracing::info!(msg_id, "edited");
-
     sleep(Duration::from_secs(3)).await;
 
-    // ── 3a. TP hit ────────────────────────────────────────────────────────────
+    // 3. Result
     tracing::info!("step 3: TP HIT");
     tg.edit(&http, msg_id,
         "✅ <b>TP HIT +12.68</b>\nXAUUSDm Long\n3325.50 → 3333.75\nVol: 0.03 lot\nBal: $5012.68",
     ).await?;
-    tracing::info!(msg_id, "edited TP HIT");
-
-    // uncomment to test SL hit instead:
-    // tg.edit(&http, msg_id,
-    //     "❌ <b>SL HIT -7.50</b>\nXAUUSDm Long\n3325.50 → 3320.00\nVol: 0.03 lot\nBal: $4992.50",
-    // ).await?;
 
     println!("\nDone ✅  check Telegram");
     Ok(())