feat: module-owned i18n with merge-at-boot translation loading

Each module can now ship its own i18n/ directory with translation files
(default_de.json, default_en.json). At boot time, ModuleI18nLoader
preloads core translations then merges module translations on top via
Reflection into I18n::$strings — the t() helper stays unchanged.

- Add i18nPath property to ModuleManifest
- Add ModuleI18nLoader with Reflection-based preload
- Extract 59 module-exclusive keys from core i18n into module files
  (notifications: 8, bookmarks: 41, addressbook: 10)
- Expand TranslationKeysTest to scan modules/ and validate against
  merged core + module translations
- Add ModuleI18nContractTest for per-module de/en parity and completeness

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

modules/addressbook/i18n/default_de.json

@@ -0,0 +1,12 @@
+{
+  "About": "Über",
+  "Address book": "Adressbuch",
+  "Call mobile": "Mobil anrufen",
+  "Call phone": "Telefon anrufen",
+  "From": "Von",
+  "No departments": "Keine Abteilungen",
+  "Quick actions": "Schnellaktionen",
+  "Send email": "E-Mail senden",
+  "To": "Bis",
+  "View in address book": "Im Adressbuch ansehen"
+}

modules/addressbook/i18n/default_en.json

@@ -0,0 +1,12 @@
+{
+  "About": "About",
+  "Address book": "Address book",
+  "Call mobile": "Call mobile",
+  "Call phone": "Call phone",
+  "From": "From",
+  "No departments": "No departments",
+  "Quick actions": "Quick actions",
+  "Send email": "Send email",
+  "To": "To",
+  "View in address book": "View in address book"
+}

modules/addressbook/module.php

@@ -94,4 +94,5 @@ return [
     ],
 
     'migrations_path' => 'db/updates',
+    'i18n_path' => 'i18n',
 ];

modules/bookmarks/i18n/default_de.json

@@ -0,0 +1,43 @@
+{
+  "Bookmarks": "Lesezeichen",
+  "Bookmark this page": "Seite als Lesezeichen speichern",
+  "Save bookmark": "Lesezeichen speichern",
+  "Bookmark name": "Lesezeichen-Name",
+  "Delete bookmark": "Lesezeichen löschen",
+  "Delete this bookmark?": "Dieses Lesezeichen wirklich löschen?",
+  "No bookmarks yet": "Noch keine Lesezeichen",
+  "New group": "Neue Gruppe",
+  "No group": "Keine Gruppe",
+  "Assign to group": "Gruppe zuweisen",
+  "Group name": "Gruppenname",
+  "Delete group": "Gruppe löschen",
+  "Group": "Gruppe",
+  "Icon": "Symbol",
+  "Maximum bookmarks reached": "Maximale Anzahl an Lesezeichen erreicht",
+  "Edit bookmark": "Lesezeichen bearbeiten",
+  "Save changes": "Änderungen speichern",
+  "Bookmark saved": "Lesezeichen gespeichert",
+  "Bookmark updated": "Lesezeichen aktualisiert",
+  "Bookmark deleted": "Lesezeichen gelöscht",
+  "Group created": "Gruppe erstellt",
+  "Group deleted": "Gruppe gelöscht",
+  "Group delete failed": "Gruppe konnte nicht gelöscht werden",
+  "Delete group and keep bookmarks?": "Gruppe löschen und enthaltene Lesezeichen behalten?",
+  "Bookmark action failed": "Lesezeichen-Aktion fehlgeschlagen",
+  "Group action failed": "Gruppen-Aktion fehlgeschlagen",
+  "Reorder saved": "Sortierung gespeichert",
+  "Reorder failed": "Sortierung fehlgeschlagen",
+  "Move group up": "Gruppe nach oben",
+  "Move group down": "Gruppe nach unten",
+  "Move bookmark up": "Lesezeichen nach oben",
+  "Move bookmark down": "Lesezeichen nach unten",
+  "Group actions": "Gruppenaktionen",
+  "Bookmark actions": "Lesezeichenaktionen",
+  "Bookmark name is required": "Lesezeichen-Name ist erforderlich",
+  "Bookmark URL is invalid": "Lesezeichen-URL ist ungültig",
+  "Group not found": "Gruppe nicht gefunden",
+  "Edit group": "Gruppe bearbeiten",
+  "Group updated": "Gruppe aktualisiert",
+  "Group name is required": "Gruppenname ist erforderlich",
+  "Maximum groups reached": "Maximale Anzahl an Gruppen erreicht"
+}

modules/bookmarks/i18n/default_en.json

@@ -0,0 +1,43 @@
+{
+  "Bookmarks": "Bookmarks",
+  "Bookmark this page": "Bookmark this page",
+  "Save bookmark": "Save bookmark",
+  "Bookmark name": "Bookmark name",
+  "Delete bookmark": "Delete bookmark",
+  "Delete this bookmark?": "Delete this bookmark?",
+  "No bookmarks yet": "No bookmarks yet",
+  "New group": "New group",
+  "No group": "No group",
+  "Assign to group": "Assign to group",
+  "Group name": "Group name",
+  "Delete group": "Delete group",
+  "Group": "Group",
+  "Icon": "Icon",
+  "Maximum bookmarks reached": "Maximum bookmarks reached",
+  "Edit bookmark": "Edit bookmark",
+  "Save changes": "Save changes",
+  "Bookmark saved": "Bookmark saved",
+  "Bookmark updated": "Bookmark updated",
+  "Bookmark deleted": "Bookmark deleted",
+  "Group created": "Group created",
+  "Group deleted": "Group deleted",
+  "Group delete failed": "Group delete failed",
+  "Delete group and keep bookmarks?": "Delete group and keep bookmarks?",
+  "Bookmark action failed": "Bookmark action failed",
+  "Group action failed": "Group action failed",
+  "Reorder saved": "Reorder saved",
+  "Reorder failed": "Reorder failed",
+  "Move group up": "Move group up",
+  "Move group down": "Move group down",
+  "Move bookmark up": "Move bookmark up",
+  "Move bookmark down": "Move bookmark down",
+  "Group actions": "Group actions",
+  "Bookmark actions": "Bookmark actions",
+  "Bookmark name is required": "Bookmark name is required",
+  "Bookmark URL is invalid": "Bookmark URL is invalid",
+  "Group not found": "Group not found",
+  "Edit group": "Edit group",
+  "Group updated": "Group updated",
+  "Group name is required": "Group name is required",
+  "Maximum groups reached": "Maximum groups reached"
+}

modules/bookmarks/module.php

@@ -130,4 +130,5 @@ return [
 
     'permissions' => [],
     'migrations_path' => null,
+    'i18n_path' => 'i18n',
 ];

modules/notifications/i18n/default_de.json

@@ -0,0 +1,10 @@
+{
+  "Notifications": "Benachrichtigungen",
+  "No notifications": "Keine Benachrichtigungen",
+  "Mark all as read": "Alle als gelesen markieren",
+  "Mark as read": "Als gelesen markieren",
+  "Dismiss": "Verwerfen",
+  "Action failed": "Aktion fehlgeschlagen",
+  "New user: %s": "Neuer Benutzer: %s",
+  "User deleted: %s": "Benutzer gelöscht: %s"
+}

modules/notifications/i18n/default_en.json

@@ -0,0 +1,10 @@
+{
+  "Notifications": "Notifications",
+  "No notifications": "No notifications",
+  "Mark all as read": "Mark all as read",
+  "Mark as read": "Mark as read",
+  "Dismiss": "Dismiss",
+  "Action failed": "Action failed",
+  "New user: %s": "New user: %s",
+  "User deleted: %s": "User deleted: %s"
+}

modules/notifications/module.php

@@ -0,0 +1,115 @@
+<?php
+
+/**
+ * Notifications module manifest.
+ *
+ * In-app notifications with bell icon, dropdown panel,
+ * event-driven creation, and scheduled cleanup.
+ */
+return [
+    'id' => 'notifications',
+    'version' => '1.0.0',
+    'enabled_by_default' => true,
+    'load_order' => 15,
+    'requires' => [],
+
+    'routes' => [
+        ['path' => 'notifications/list-data', 'target' => 'notifications/list-data'],
+        ['path' => 'notifications/mark-read-data', 'target' => 'notifications/mark-read-data'],
+        ['path' => 'notifications/delete-data', 'target' => 'notifications/delete-data'],
+        ['path' => 'notifications/unread-count-data', 'target' => 'notifications/unread-count-data'],
+    ],
+    'public_paths' => [],
+
+    'container_registrars' => [
+        \MintyPHP\Module\Notifications\NotificationsContainerRegistrar::class,
+    ],
+
+    'ui_slots' => [
+        'topbar.right_item' => [
+            [
+                'key' => 'notifications-bell',
+                'template' => 'templates/topbar-notification-bell.phtml',
+                'permission' => 'notifications.view',
+                'order' => 100,
+            ],
+        ],
+        'layout.head_style' => [
+            [
+                'key' => 'notifications-topbar-style',
+                'path' => 'modules/notifications/css/layout/app-topbar-notifications.css',
+                'permission' => 'notifications.view',
+                'order' => 100,
+            ],
+            [
+                'key' => 'notifications-dropdown-style',
+                'path' => 'modules/notifications/css/components/app-notification-dropdown.css',
+                'permission' => 'notifications.view',
+                'order' => 101,
+            ],
+        ],
+        'runtime.component' => [
+            [
+                'key' => 'notification-bell',
+                'script' => 'modules/notifications/js/components/app-notification-bell.js',
+                'export' => 'initNotificationBell',
+                'scope' => 'global',
+                'config_path' => 'components.notificationBell',
+                'default_config' => [],
+                'phase' => 'late',
+                'permission' => 'notifications.view',
+                'order' => 100,
+            ],
+        ],
+    ],
+
+    'authorization_policies' => [
+        \MintyPHP\Module\Notifications\NotificationsAuthorizationPolicy::class,
+    ],
+
+    'permissions' => [
+        [
+            'key' => 'notifications.view',
+            'label' => 'Notifications: View',
+            'description' => 'View and manage own notifications',
+        ],
+    ],
+
+    'event_listeners' => [
+        'user.created' => [
+            ['class' => \MintyPHP\Module\Notifications\Listeners\UserCreatedNotificationListener::class, 'method' => 'handle'],
+        ],
+        'user.deleted' => [
+            ['class' => \MintyPHP\Module\Notifications\Listeners\UserDeletedNotificationListener::class, 'method' => 'handle'],
+        ],
+    ],
+
+    'scheduler_jobs' => [
+        [
+            'job_key' => 'notifications_cleanup',
+            'handler' => \MintyPHP\Module\Notifications\Handler\NotificationCleanupJobHandler::class,
+            'label' => 'Notification cleanup',
+            'description' => 'Purges read notifications older than 90 days',
+            'default_enabled' => 1,
+            'default_timezone' => 'UTC',
+            'default_schedule_type' => 'daily',
+            'default_schedule_interval' => 1,
+            'default_schedule_time' => '04:00',
+            'default_schedule_weekdays_csv' => null,
+            'default_catchup_once' => 1,
+            'allowed_schedule_types' => ['daily', 'weekly'],
+        ],
+    ],
+
+    'layout_context_providers' => [
+        \MintyPHP\Module\Notifications\Providers\NotificationsLayoutProvider::class,
+    ],
+    'session_providers' => [
+        \MintyPHP\Module\Notifications\Providers\NotificationsSessionProvider::class,
+    ],
+
+    'search_resources' => [],
+    'asset_groups' => [],
+    'migrations_path' => 'db/updates',
+    'i18n_path' => 'i18n',
+];