fix(doctor): honest module count, temp-path audit warning, connection line

Three doctor-page findings from the usertest panel:

- Module tile no longer counts the hub's built-in 'system'
  pseudo-module — a fresh hub shows 0 modules, matching the
  welcome checklist's definition of an install. Counting is a
  top-level function with unit tests.
- When the audit DB lives in an OS-cleanable temp directory
  (/var/folders, /tmp, Windows Temp), the daemon-files panel
  says so instead of presenting the state as healthy. The
  classifier is a top-level function with unit tests.
- The daemon card states who-talks-to-whom-how in one line:
  endpoint, transport security (TLS / unencrypted-local /
  unencrypted), and whether a bearer token is attached (length
  only) — the auditor's baseline the green dot cannot answer.

Also syncs pubspec.yaml (0.70.0 -> 0.72.0) with kStudioVersion,
which had drifted to 0.71.0 while pubspec stayed behind.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/l10n/app_localizations_en.dart

@@ -2261,6 +2261,32 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get doctorDaemonControlWorking => 'Working…';
 
+  @override
+  String doctorConnLine(String endpoint, String transport, String auth) {
+    return 'Connection: $endpoint · $transport · $auth';
+  }
+
+  @override
+  String get doctorConnTls => 'TLS-encrypted';
+
+  @override
+  String get doctorConnPlainLocal => 'unencrypted (stays on this machine)';
+
+  @override
+  String get doctorConnPlainRemote => 'unencrypted';
+
+  @override
+  String doctorConnToken(int count) {
+    return 'token configured ($count characters)';
+  }
+
+  @override
+  String get doctorConnAnonymous => 'no token (anonymous)';
+
+  @override
+  String get doctorDbVolatileWarning =>
+      'The audit database is stored in a temporary folder the operating system may clean up at any time. For real evidence, move the hub\'s data directory to a permanent location.';
+
   @override
   String get doctorPathLog => 'Log';