Add EUR/USD support with modular per-pair signal producer pattern

- Register EUR/USD in config (pip 0.0001, EurUsdStrategyConfig)
- Create pair_signals/ module: registry + dispatcher with per-pair
  config factories (xauusd.py, eurusd.py) for easy add/remove
- EUR/USD gets forex-tuned regime weights, London+NY session hours,
  XAU strategy gates disabled
- Add defense-in-depth display_name guards in signal_aggregator
- Rename telegram_bot.py → testing_telegram_bot.py with separate
  bot token, both pairs with dedicated button rows
- Add EUR/USD to news engine affected pairs map
- 9 new tests (146 total, all passing)
- Zero changes to engine.py, data_provider.py, main.py, backtest/

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

pair_signals/eurusd.py

@@ -0,0 +1,58 @@
+"""EUR/USD signal producer config."""
+
+from typing import Optional, List
+from config import PlatformConfig, Timeframe, EURUSD
+
+_CONFIRMATIONS = {
+    Timeframe.M5:  [Timeframe.M15, Timeframe.H1],
+    Timeframe.M15: [Timeframe.M5, Timeframe.H1],
+    Timeframe.H1:  [Timeframe.M15, Timeframe.H4],
+    Timeframe.H4:  [Timeframe.H1, Timeframe.D1],
+}
+
+_TRENDING = {
+    "ema_trend": 2.0, "rsi": 1.0, "macd": 2.0,
+    "bollinger": 0.5, "keltner": 1.0, "roc": 1.5,
+    "candlestick": 0.5, "divergence": 2.0, "adx": 1.0,
+}
+
+EUR_REGIME_WEIGHTS = {
+    "trending_up": _TRENDING,
+    "trending_down": _TRENDING,
+    "trending": _TRENDING,
+    "ranging": {
+        "ema_trend": 0.3, "rsi": 2.0, "macd": 1.0,
+        "bollinger": 2.0, "keltner": 1.5, "roc": 0.5,
+        "candlestick": 0.8, "divergence": 2.5, "adx": 0.5,
+    },
+    "transitioning": {
+        "ema_trend": 1.5, "rsi": 1.5, "macd": 2.0,
+        "bollinger": 1.0, "keltner": 1.5, "roc": 2.0,
+        "candlestick": 0.8, "divergence": 2.0, "adx": 1.0,
+    },
+}
+
+
+def make_config(
+    primary_tf: Timeframe,
+    confirmation_tfs: Optional[List[Timeframe]] = None,
+) -> PlatformConfig:
+    config = PlatformConfig()
+    config.symbol = EURUSD
+    config.display_name = "EUR/USD"
+    config.pip_value = 0.0001
+    config.primary_timeframe = primary_tf
+    config.confirmation_timeframes = (
+        confirmation_tfs or _CONFIRMATIONS.get(primary_tf, [Timeframe.M15, Timeframe.H4])
+    )
+
+    config.xau_strategy.enabled = False
+
+    config.backtest.session_start_hour = 7
+    config.backtest.session_end_hour = 20
+    config.backtest.blocked_hours_utc = [22, 23, 0, 1, 2, 3]
+    config.backtest.allowed_weekdays = [0, 1, 2, 3, 4]
+
+    config.technical.regime_weights_override = EUR_REGIME_WEIGHTS
+
+    return config