feat(train): the instance names its map source (ADR 0030, D11, D22)

Train's first endpoint of its own, map.source, names the map workouts
are drawn on, for people signed in only, as a provider's key may be in
its style's address: OpenFreeMap's Liberty style where the operator sets
nothing, else MAP_STYLE_URL (HTTPS only) with MAP_SOURCE_NAME,
MAP_ATTRIBUTION and MAP_ABOUT_URL. A model without a table: no
migration. D22 is recorded in ADR 0030.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/train/halkyon_train_server/test/integration/map/map_endpoint_test.dart

@@ -0,0 +1,36 @@
+import 'package:serverpod/serverpod.dart';
+import 'package:test/test.dart';
+
+import '../test_tools/serverpod_test_tools.dart';
+
+/// The map the app draws workouts on, as the instance names it (ADR 0030,
+/// D11, D22): for the people signed in, as the provider's key may be in it.
+void main() {
+  withServerpod('The map source', (sessionBuilder, endpoints) {
+    test('names OpenFreeMap to someone signed in, where the operator sets '
+        'nothing', () async {
+      final source = await endpoints.map.source(
+        sessionBuilder.copyWith(
+          authentication: AuthenticationOverride.authenticationInfo(
+            const Uuid().v7(),
+            {},
+          ),
+        ),
+      );
+
+      expect(source.name, 'OpenFreeMap');
+      expect(source.styleUrl, startsWith('https://tiles.openfreemap.org/'));
+    });
+
+    test('names nothing to nobody signed in', () async {
+      await expectLater(
+        endpoints.map.source(
+          sessionBuilder.copyWith(
+            authentication: AuthenticationOverride.unauthenticated(),
+          ),
+        ),
+        throwsA(isA<ServerpodUnauthenticatedException>()),
+      );
+    });
+  });
+}

apps/train/halkyon_train_server/test/integration/test_tools/serverpod_test_tools.dart

@@ -11,9 +11,12 @@
 // ignore_for_file: no_leading_underscores_for_local_identifiers
 
 // ignore_for_file: no_leading_underscores_for_library_prefixes
+import 'dart:async' as _ida;
 import 'dart:io' as _idi;
 import 'package:halkyon_train_server/src/generated/future_calls.dart'
     as _i59xasdy;
+import 'package:halkyon_train_server/src/generated/map/map_source.dart'
+    as _ip8bmyd2;
 import 'package:serverpod/serverpod.dart' as _is;
 import 'package:serverpod_test/serverpod_test.dart' as _ist;
 import 'package:halkyon_train_server/src/generated/protocol.dart';
@@ -150,6 +153,8 @@ void withServerpod(
 
 class TestEndpoints {
   late final futureCalls = _FutureCalls();
+
+  late final _MapEndpoint map;
 }
 
 class _InternalTestEndpoints extends TestEndpoints
@@ -158,13 +163,59 @@ class _InternalTestEndpoints extends TestEndpoints
   void initialize(
     _is.SerializationManager serializationManager,
     _is.EndpointDispatch endpoints,
-  ) {}
+  ) {
+    map = _MapEndpoint(
+      endpoints,
+      serializationManager,
+    );
+  }
 }
 
 class _FutureCalls {
   late final pruning = _PruningFutureCall();
 }
 
+class _MapEndpoint {
+  _MapEndpoint(
+    this._endpointDispatch,
+    this._serializationManager,
+  );
+
+  final _is.EndpointDispatch _endpointDispatch;
+
+  final _is.SerializationManager _serializationManager;
+
+  _ida.Future<_ip8bmyd2.MapSource> source(
+    _ist.TestSessionBuilder sessionBuilder,
+  ) async {
+    return _ist.callAwaitableFunctionAndHandleExceptions(() async {
+      var _localUniqueSession =
+          (sessionBuilder as _ist.InternalTestSessionBuilder).internalBuild(
+            endpoint: 'map',
+            method: 'source',
+          );
+      try {
+        var _localCallContext = await _endpointDispatch.getMethodCallContext(
+          createSessionCallback: (_) => _localUniqueSession,
+          endpointPath: 'map',
+          methodName: 'source',
+          parameters: _ist.testObjectToJson({}),
+          serializationManager: _serializationManager,
+        );
+        var _localReturnValue =
+            await (_localCallContext.method.call(
+                  _localUniqueSession,
+                  _localCallContext.arguments,
+                )
+                as _ida.Future<_ip8bmyd2.MapSource>);
+        return _localReturnValue;
+      } finally {
+        await _localUniqueSession.close();
+      }
+    });
+  }
+}
+
 class _PruningFutureCall {
   Future<void> pruneAccounts(_ist.TestSessionBuilder sessionBuilder) async {
     var _localUniqueSession =