feat: Telegram notifications + SSE position stream + PnL summary

- Add telegram.rs: send/edit messages via Bot API
- Add SSE position listener: position_opened → edit "Filled",
  position_closed → edit TP/SL result + send daily+alltime PnL summary
- Extend State with tg_message_id and trade details for notifications
- Add PosState to persist position info across SSE events
- Add Deal domain type and history_deals() client method
- New env: TELEGRAM_BOT_TOKEN, TELEGRAM_CHAT_ID, TELEGRAM_THREAD_ID

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

crates/domain/src/deal.rs

@@ -0,0 +1,26 @@
+use chrono::{DateTime, Utc};
+use rust_decimal::Decimal;
+use serde::Deserialize;
+
+use crate::serde_helpers;
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct Deal {
+    pub ticket: u64,
+    #[serde(with = "serde_helpers::naive_utc_secs")]
+    pub time: DateTime<Utc>,
+    pub entry: u8,   // 0 = open, 1 = close
+    pub magic: u64,
+    #[serde(deserialize_with = "serde_helpers::de_decimal")]
+    pub volume: Decimal,
+    #[serde(deserialize_with = "serde_helpers::de_decimal")]
+    pub price: Decimal,
+    #[serde(deserialize_with = "serde_helpers::de_decimal")]
+    pub profit: Decimal,
+    #[serde(deserialize_with = "serde_helpers::de_decimal")]
+    pub commission: Decimal,
+    #[serde(deserialize_with = "serde_helpers::de_decimal")]
+    pub swap: Decimal,
+    pub symbol: String,
+    pub comment: String,
+}

crates/domain/src/lib.rs

@@ -2,6 +2,7 @@ mod serde_helpers;
 
 pub mod account;
 pub mod candle;
+pub mod deal;
 pub mod position;
 pub mod symbol;
 pub mod tick;
@@ -9,6 +10,7 @@ pub mod timeframe;
 
 pub use account::AccountInfo;
 pub use candle::Candle;
+pub use deal::Deal;
 pub use position::{Position, Side};
 pub use symbol::Symbol;
 pub use tick::Tick;