Add EUR/USD support and 4-button Telegram scanner

Add EURUSD pair with dynamic pair info lookup. Telegram bot now shows
4 scan buttons: EUR/USD 15M, EUR/USD 1H, USD/JPY 15M, USD/JPY 1H.
Each indicator displays directional arrows in the message output.
Price formatting adapts per pair (5dp for EUR, 3dp for JPY).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

config.py

@@ -1,5 +1,5 @@
 """
-ForexBot2 — Configuration (USD/JPY focus)
+ForexBot2 — Configuration
 ==========================================
 """
 
@@ -35,10 +35,18 @@ class MarketSession(Enum):
     OVERLAP_LONDON_NY = "london_ny_overlap"
 
 
-# ── Single Focus: USD/JPY ─────────────────────────────────────────
+# ── Supported pairs ──────────────────────────────────────────────
 USDJPY = "USDJPY=X"
+EURUSD = "EURUSD=X"
+
+PAIR_INFO = {
+    USDJPY: {"display": "USD/JPY", "pip_value": 0.01, "is_jpy_pair": True},
+    EURUSD: {"display": "EUR/USD", "pip_value": 0.0001, "is_jpy_pair": False},
+}
+
+# Defaults (kept for backward compat)
 DISPLAY = "USD/JPY"
-PIP_VALUE = 0.01  # JPY pairs use 0.01 per pip
+PIP_VALUE = 0.01
 
 
 @dataclass
@@ -109,7 +117,7 @@ class SignalConfig:
 @dataclass
 class NewsConfig:
     """Economic calendar & sentiment."""
-    tracked_currencies: List[str] = field(default_factory=lambda: ["USD", "JPY"])
+    tracked_currencies: List[str] = field(default_factory=lambda: ["USD", "JPY", "EUR"])
     min_impact: str = "medium"
     pre_event_buffer_minutes: int = 30
     post_event_buffer_minutes: int = 15