feat: add RulesConfig with v1 defaults

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

source/RulesConfig.mc

@@ -0,0 +1,19 @@
+import Toybox.Lang;
+
+// Configurable padel rules. v1 uses the defaults below; a future settings
+// screen will mutate an instance of this class — the engine reads it as-is.
+class RulesConfig {
+    public var goldenPoint as Boolean;      // true = sudden death at 40-40
+    public var gamesPerSet as Number;       // games needed to take a set (before win-by-2)
+    public var setsToWin as Number;         // sets needed to win the match
+    public var tiebreakEnabled as Boolean;  // play a tiebreak at gamesPerSet-all
+    public var tiebreakTarget as Number;    // points needed to win a tiebreak (before win-by-2)
+
+    public function initialize() {
+        goldenPoint = true;
+        gamesPerSet = 6;
+        setsToWin = 2;
+        tiebreakEnabled = true;
+        tiebreakTarget = 7;
+    }
+}