Implement comprehensive localization framework with English and Finnish support

- Add flutter_localizations dependency and l10n configuration
- Create ARB files for English (en) and Finnish (fi) translations
- Localize UI strings across all major components:
  * Navigation drawer and page titles
  * Scoring interface (arrows per end, ruleset names)
  * Scorecard headers (End, Arrows, Sum of 3/6, Accumulative)
  * Keypad functional buttons (CLEAR/TYHJENNÄ, CLOSE/SULJE)
  * Settings page placeholder content
  * Dialog messages and confirmation prompts
- Preserve universal archery scoring notation (X, 10, 9, M remain unlocalised)
- Use authentic Finnish archery terminology throughout
- Configure main app with proper localization delegates and supported locales
- Generate localization classes automatically via flutter_localizations

🤖 Generated with [Claude Code](https://claude.ai/code)

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

lib/presentation/pages/scoring_page.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import '../../config/localization/generated/app_localizations.dart';
 import '../widgets/scoring_grid/scoring_grid.dart';
 import '../widgets/scoring_grid/scoring_keypad.dart';
 import '../widgets/common/toggle_switches.dart';
@@ -87,16 +88,17 @@ class _ScoringPageState extends State<ScoringPage> with SingleTickerProviderStat
       final bool? keepScores = await showDialog<bool>(
         context: context,
         builder: (BuildContext context) {
+          final l10n = AppLocalizations.of(context)!;
           return AlertDialog(
-            title: const Text('Keep scores?'),
+            title: Text(l10n.dialogKeepScoresTitle),
             actions: [
               TextButton(
                 onPressed: () => Navigator.of(context).pop(false),
-                child: const Text('No'),
+                child: Text(l10n.dialogNo),
               ),
               TextButton(
                 onPressed: () => Navigator.of(context).pop(true),
-                child: const Text('Yes'),
+                child: Text(l10n.dialogYes),
               ),
             ],
           );