Settings: collapse advanced sections + dedicated About + default DB name

- DB default name: "proserve" → "proserveapi" (matches the ASTERION install
  script that provisions XAMPP on client machines).
- Settings dialog reorganized:
   1. License de mise à jour     [expanded] ← business-critical
   2. Langue                     [expanded] ← user preference
   3. ▸ PARAMÈTRES AVANCÉS       [collapsed by default]
        contains Server, Installation, Cache, Database, Logs
   4. À PROPOS                   [expanded] ← version + copyright
- The Expander hides plumbing the casual user shouldn't touch (server URL,
  install root, MySQL config, cache directory) but keeps it one click away
  for power users / support diagnostics.
- About card kept always-visible because version info is what support asks
  for first when troubleshooting.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/PSLauncher.Core/Localization/Strings.cs

@@ -152,6 +152,14 @@ public static class Strings
         "تطبيق الترقيات تلقائياً عند تثبيت نسخة جديدة"
     );
     public static string SettingsDbReplay   => T("🔁  Rejouer les migrations", "🔁  Replay migrations", "🔁  重新执行迁移", "🔁  เรียกใช้การโยกย้ายอีกครั้ง", "🔁  إعادة تشغيل الترقيات");
+    public static string SettingsAdvanced   => T(
+        "▸  PARAMÈTRES AVANCÉS (serveur, installation, base de données, logs)",
+        "▸  ADVANCED SETTINGS (server, installation, database, logs)",
+        "▸  高级设置（服务器、安装、数据库、日志）",
+        "▸  ตั้งค่าขั้นสูง (เซิร์ฟเวอร์ การติดตั้ง ฐานข้อมูล บันทึก)",
+        "▸  الإعدادات المتقدمة (الخادم، التثبيت، قاعدة البيانات، السجلات)"
+    );
+    public static string SettingsAbout      => T("À PROPOS", "ABOUT", "关于", "เกี่ยวกับ", "حول");
     public static string SettingsDbHint     => T(
         "Le launcher applique automatiquement les scripts SQL bundled dans _migrations/ de chaque ZIP PROSERVE. Mot de passe stocké chiffré DPAPI.",
         "The launcher automatically applies SQL scripts bundled in each PROSERVE ZIP's _migrations/ folder. Password stored DPAPI-encrypted.",