Add chart generation: /chart command + /signal sends chart

- charts.py: candlestick (mplfinance, dark theme) with EMA20/50
  overlay, Bollinger Bands, RSI subplot and 30/70 reference lines
- /signal now sends chart image with analysis as caption
- New /chart <PAIR> <TF> command for standalone chart view

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

main.py

@@ -11,6 +11,7 @@ from telegram.ext import (
 )
 
 from config import SUPPORTED_PAIRS, SUPPORTED_TIMEFRAMES, TELEGRAM_TOKEN
+from charts import generate as generate_chart
 from indicators import bollinger, macd, rsi
 from signals import HTF_OF, analyze, emoji
 from twelvedata import fetch_ohlc
@@ -31,7 +32,8 @@ WELCOME = (
     "/rsi <PAIR> <TF> — RSI value\n"
     "/macd <PAIR> <TF> — MACD line/signal/histogram\n"
     "/bb <PAIR> <TF> — Bollinger Bands\n"
-    "/signal <PAIR> <TF> — multi-indicator weighted verdict with HTF trend filter\n"
+    "/signal <PAIR> <TF> — multi-indicator weighted verdict with chart\n"
+    "/chart <PAIR> <TF> — candlestick chart with EMA/BB/RSI\n"
     "/help — this message"
 ) + DISCLAIMER
 
@@ -131,6 +133,18 @@ def _format_reading(r) -> str:
     return f"• {r.name}: {r.value} ({sign}{r.contribution})"
 
 
+async def chart_cmd(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
+    try:
+        pair, tf = _parse_pair_tf(ctx.args)
+        df = await fetch_ohlc(pair, tf)
+        img = generate_chart(df, pair, tf)
+        caption = f"*{pair}* {tf} — candlestick · EMA20/50 · BB(20,2) · RSI(14)" + DISCLAIMER
+        await update.message.reply_photo(img, caption=caption, parse_mode="Markdown")
+    except Exception as e:
+        logger.exception("chart_cmd failed")
+        await _reply(update, f"Error: {e}")
+
+
 async def signal_cmd(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
     try:
         pair, tf = _parse_pair_tf(ctx.args)
@@ -177,7 +191,13 @@ async def signal_cmd(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
         if report["notes"]:
             lines += ["", *[f"_{n}_" for n in report["notes"]]]
 
-        await _reply(update, "\n".join(lines))
+        caption = "\n".join(lines) + DISCLAIMER
+        img = generate_chart(
+            df, pair, tf,
+            verdict=report["verdict"],
+            confidence=report["confidence"],
+        )
+        await update.message.reply_photo(img, caption=caption, parse_mode="Markdown")
     except Exception as e:
         logger.exception("signal_cmd failed")
         await _reply(update, f"Error: {e}")
@@ -191,7 +211,8 @@ BOT_COMMANDS: list[BotCommand] = [
     BotCommand("rsi", "RSI(14) — /rsi EURUSD 1h"),
     BotCommand("macd", "MACD(12,26,9) — /macd EURUSD 1h"),
     BotCommand("bb", "Bollinger Bands(20,2) — /bb EURUSD 1h"),
-    BotCommand("signal", "Multi-indicator verdict — /signal EURUSD 1h"),
+    BotCommand("signal", "Multi-indicator verdict + chart — /signal EURUSD 1h"),
+    BotCommand("chart", "Candlestick chart with EMA/BB/RSI — /chart EURUSD 1h"),
 ]
 
 
@@ -216,6 +237,7 @@ def main() -> None:
     app.add_handler(CommandHandler("macd", macd_cmd))
     app.add_handler(CommandHandler("bb", bb_cmd))
     app.add_handler(CommandHandler("signal", signal_cmd))
+    app.add_handler(CommandHandler("chart", chart_cmd))
     logger.info("Bot starting...")
     app.run_polling()