feat: session filter, breakeven SL, daily loss limit, startup alert, multi-pair web

Bot improvements:
- Session filter (SESSION_FROM_UTC/TO_UTC) — backtest confirms 08-13 UTC optimal for XAU
- Breakeven SL management (BREAKEVEN_AT_RR) — disabled by default, hurts XAU momentum
- Daily loss limit circuit breaker (DAILY_LOSS_LIMIT_PCT)
- Telegram startup alert with symbol, session, risk, and balance
- MT5 modify_position (TRADE_ACTION_SLTP) support in mt5-client

Web updates:
- Version badge auto-fetched from GitHub Releases API
- GitHub icon link in Nav and footer
- Multi-pair general (not XAUUSDm-specific)
- BTCUSDm backtest results added, session params in params table
- Trades page uses rolling 90-day window instead of hardcoded date

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

crates/mt5-client/src/client.rs

@@ -97,6 +97,23 @@ impl Mt5Client {
         Ok(w.data)
     }
 
+    pub async fn modify_position(
+        &self,
+        ticket: u64,
+        symbol: &str,
+        sl: f64,
+        tp: f64,
+    ) -> Result<TradeResult, Mt5Error> {
+        let req = TradeRequest::modify_sltp(symbol, ticket, sl, tp);
+        #[derive(serde::Serialize)]
+        struct Body<'a> { request: &'a TradeRequest }
+        let url  = format!("{}/order/send", self.base_url);
+        let text = self.fetch_text(self.http.post(&url).json(&Body { request: &req })).await?;
+        tracing::debug!(endpoint = %url, ticket, "modify position ok");
+        let w: DataOne<TradeResult> = serde_json::from_str(&text)?;
+        Ok(w.data)
+    }
+
     pub async fn cancel_order(&self, ticket: u64, symbol: &str) -> Result<TradeResult, Mt5Error> {
         let req = TradeRequest::cancel(symbol, ticket);
         #[derive(serde::Serialize)]

crates/mt5-client/src/types.rs

@@ -31,6 +31,9 @@ pub struct TradeRequest {
     /// Ticket number — required for TRADE_ACTION_REMOVE (cancel pending order)
     #[serde(skip_serializing_if = "Option::is_none")]
     pub order: Option<u64>,
+    /// Position ticket — required for TRADE_ACTION_SLTP (modify SL/TP)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub position: Option<u64>,
     /// Allowed price deviation in points
     #[serde(skip_serializing_if = "Option::is_none")]
     pub deviation: Option<u32>,
@@ -63,6 +66,25 @@ impl TradeRequest {
             magic: Some(magic),
             comment: Some(comment.into()),
             order: None,
+            position: None,
+            deviation: None,
+        }
+    }
+
+    pub fn modify_sltp(symbol: impl Into<String>, position: u64, sl: f64, tp: f64) -> Self {
+        // TRADE_ACTION_SLTP = 6
+        Self {
+            action: 6,
+            symbol: symbol.into(),
+            volume: None,
+            order_type: None,
+            price: None,
+            sl: Some(sl),
+            tp: Some(tp),
+            magic: None,
+            comment: None,
+            order: None,
+            position: Some(position),
             deviation: None,
         }
     }
@@ -81,6 +103,7 @@ impl TradeRequest {
             magic: None,
             comment: None,
             order: Some(ticket),
+            position: None,
             deviation: None,
         }
     }