Mitra Profil: WA/TG contacts + Keluar-only (no Hapus Akun)

Replaces the placeholder "Hubungi Koordinator" row with two real
contacts pulled from backend config (support_handles_json), and drops
the "Hapus Akun" CTA. Mirrors the figma BestieProfile design but uses
the same WA/TG channel as the customer Tanya Admin sheet — business
decided the same ops team triages both audiences.

Backend:
- Promote support-handles route from /api/client to /api/shared
  (renamed file + export). Both apps now consume the same endpoint;
  hitting /api/client/* from mitra would violate the per-app
  convention in mitra_app/CLAUDE.md.
- client_app provider updated to /api/shared/support-handles.

Mitra app:
- New support_handles_provider mirroring the client_app one. Adds a
  `displayHandle` getter that strips the URL scheme for the subtitle
  ("https://wa.me/X" → "wa.me/X", "https://t.me/Y" → "t.me/Y") so the
  row looks like the figma without exposing raw URLs.
- Profil screen now lists: Chat WhatsApp Kami, Chat Telegram Kami,
  Syarat & Ketentuan, Kebijakan Privasi. Danger zone simplified to
  Keluar only — mitras request account deletion through the same
  WA/TG channels (no separate self-service path).
- url_launcher added as a runtime dep, launches deeplinks in
  externalApplication mode with graceful snackbar fallback when
  parsing or launching fails.

Updates [[feedback-mitra-internal-audience]] — pre-login rule still
holds (no admin CTAs on S3a/S3b/AccountInactive), but the post-login
Profil tab now does surface WA/TG. Overrides decided 2026-05-21.

Verified on emulator-5556: Profil tab renders both rows with handles
from `wa.me/6285173310010` + `t.me/halobestie`, Keluar present, no
Hapus Akun button.

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

mitra_app/lib/features/profile/support_handles_provider.dart

@@ -0,0 +1,43 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import '../../core/api/api_client_provider.dart';
+
+class SupportHandle {
+  final String label;
+  final String deeplink;
+  const SupportHandle({required this.label, required this.deeplink});
+
+  factory SupportHandle.fromJson(Map<String, dynamic> json) =>
+      SupportHandle(
+        label: json['label'] as String? ?? '',
+        deeplink: json['deeplink'] as String? ?? '',
+      );
+
+  /// Display form for the menu subtitle: strip the URL scheme so
+  /// "https://wa.me/6285173310010" → "wa.me/6285173310010" and
+  /// "https://t.me/halobestie" → "t.me/halobestie". Falls back to the
+  /// raw deeplink when there's no scheme to strip.
+  String get displayHandle {
+    if (deeplink.isEmpty) return '';
+    final stripped = deeplink.replaceFirst(RegExp(r'^https?://'), '');
+    return stripped;
+  }
+}
+
+class SupportHandles {
+  final SupportHandle? wa;
+  final SupportHandle? telegram;
+  const SupportHandles({this.wa, this.telegram});
+
+  factory SupportHandles.fromJson(Map<String, dynamic> json) {
+    SupportHandle? parse(dynamic v) =>
+        v is Map<String, dynamic> ? SupportHandle.fromJson(v) : null;
+    return SupportHandles(wa: parse(json['wa']), telegram: parse(json['telegram']));
+  }
+}
+
+final supportHandlesProvider = FutureProvider<SupportHandles>((ref) async {
+  final api = ref.read(apiClientProvider);
+  final response = await api.get('/api/shared/support-handles');
+  final data = response['data'] as Map<String, dynamic>? ?? const {};
+  return SupportHandles.fromJson(data);
+});