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>

config.py

@@ -37,9 +37,11 @@ class MarketSession(Enum):
 
 # ── Supported pairs ──────────────────────────────────────────────
 XAUUSD = "XAU/USD"
+EURUSD = "EUR/USD"
 
 PAIR_INFO = {
     XAUUSD: {"display": "XAU/USD", "pip_value": 0.10, "is_jpy_pair": False},
+    EURUSD: {"display": "EUR/USD", "pip_value": 0.0001, "is_jpy_pair": False},
 }
 
 
@@ -123,7 +125,7 @@ class SignalConfig:
 @dataclass
 class NewsConfig:
     """Economic calendar & sentiment."""
-    tracked_currencies: List[str] = field(default_factory=lambda: ["USD", "XAU"])
+    tracked_currencies: List[str] = field(default_factory=lambda: ["USD", "XAU", "EUR"])
     min_impact: str = "medium"
     pre_event_buffer_minutes: int = 30
     post_event_buffer_minutes: int = 15
@@ -159,6 +161,18 @@ class XauStrategyConfig:
     sell_min_quality: List[str] = field(default_factory=lambda: ["A+", "A", "B"])
 
 
+@dataclass
+class EurUsdStrategyConfig:
+    """EUR/USD strategy config — separate from XAU for independent tuning."""
+    enabled: bool = True
+    blocked_hours_utc: List[int] = field(default_factory=lambda: [22, 23, 0, 1, 2, 3])
+    weekend_filter: bool = True
+    allowed_weekdays: List[int] = field(default_factory=lambda: [0, 1, 2, 3, 4])
+    min_atr_threshold: float = 0.0003
+    sl_atr_multiplier: float = 1.5
+    tp_atr_multiplier: float = 1.0
+
+
 @dataclass
 class FilterConfig:
     """Regime and session filters for live signals."""
@@ -182,6 +196,7 @@ class PlatformConfig:
     news: NewsConfig = field(default_factory=NewsConfig)
     backtest: FilterConfig = field(default_factory=FilterConfig)
     xau_strategy: XauStrategyConfig = field(default_factory=XauStrategyConfig)
+    eur_strategy: EurUsdStrategyConfig = field(default_factory=EurUsdStrategyConfig)
 
     symbol: str = XAUUSD
     display_name: str = "XAU/USD"