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/config/localization/generated/app_localizations_en.dart

@@ -0,0 +1,144 @@
+// ignore: unused_import
+import 'package:intl/intl.dart' as intl;
+import 'app_localizations.dart';
+
+// ignore_for_file: type=lint
+
+/// The translations for English (`en`).
+class AppLocalizationsEn extends AppLocalizations {
+  AppLocalizationsEn([String locale = 'en']) : super(locale);
+
+  @override
+  String get appTitle => 'Archery Bookkeeper';
+
+  @override
+  String get appVersion => 'Alpha 0.1';
+
+  @override
+  String get navMainScorer => 'Main (Scorer)';
+
+  @override
+  String get navSettings => 'Settings';
+
+  @override
+  String get arrowsPerEnd => 'Arrows per end';
+
+  @override
+  String get ruleset => 'Ruleset';
+
+  @override
+  String get rulesetIndoor => 'Indoor';
+
+  @override
+  String get rulesetOutdoor => 'Outdoor';
+
+  @override
+  String endsCount(int count) {
+    return '$count ends';
+  }
+
+  @override
+  String get headerEnd => 'End';
+
+  @override
+  String get headerArrows => 'Arrows';
+
+  @override
+  String get headerSumOf3 => 'Sum of 3';
+
+  @override
+  String get headerSumOf6 => 'Sum of 6';
+
+  @override
+  String get headerAccumulative => 'Accumulative';
+
+  @override
+  String get headerXCount => 'X';
+
+  @override
+  String get header10Count => '10';
+
+  @override
+  String get header9Count => '9';
+
+  @override
+  String get scoreTotal => 'Total';
+
+  @override
+  String get keypadClear => 'CLEAR';
+
+  @override
+  String get keypadClose => 'CLOSE';
+
+  @override
+  String get dialogClearScoresTitle => 'Clear scores';
+
+  @override
+  String get dialogClearScoresMessage =>
+      'This will clear all scores for the current session. Continue?';
+
+  @override
+  String get dialogArrowChangeTitle => 'Change arrow count';
+
+  @override
+  String get dialogArrowChangeMessage =>
+      'Changing arrow count will clear existing scores. Continue?';
+
+  @override
+  String get dialogPreserveScores => 'Preserve existing scores when possible?';
+
+  @override
+  String get dialogCancel => 'Cancel';
+
+  @override
+  String get dialogContinue => 'Continue';
+
+  @override
+  String get dialogYes => 'Yes';
+
+  @override
+  String get dialogNo => 'No';
+
+  @override
+  String get settingsTitle => 'Settings';
+
+  @override
+  String get settingsAppearance => 'Appearance';
+
+  @override
+  String get settingsScoring => 'Scoring';
+
+  @override
+  String get settingsExport => 'Export';
+
+  @override
+  String get settingsAbout => 'About';
+
+  @override
+  String get settingsPlaceholder => 'This is a placeholder settings page.';
+
+  @override
+  String get settingsFutureWillInclude => 'Future settings will include:';
+
+  @override
+  String get settingsColorScheme => '• Color scheme preferences';
+
+  @override
+  String get settingsDefaultArrows => '• Default arrow counts';
+
+  @override
+  String get settingsScoreInput => '• Score input preferences';
+
+  @override
+  String get settingsExportOptions => '• Export settings';
+
+  @override
+  String get settingsSessionManagement => '• Session management';
+
+  @override
+  String get dialogKeepScoresTitle => 'Keep scores?';
+
+  @override
+  String get devTodoLocalization =>
+      'REPLACE ALL THESE TEXTS WITH LOCALISATION MARKERS!!';
+}