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_en.arb

@@ -1291,6 +1291,25 @@
   "doctorPillStopped": "stopped",
   "doctorDaemonControlHint": "Studio shells out to the platform binary — mirrors chain daemon … exactly so the CLI and UI stay in lockstep.",
   "doctorDaemonControlWorking": "Working…",
+  "doctorConnLine": "Connection: {endpoint} · {transport} · {auth}",
+  "@doctorConnLine": {
+    "placeholders": {
+      "endpoint": {"type": "String"},
+      "transport": {"type": "String"},
+      "auth": {"type": "String"}
+    }
+  },
+  "doctorConnTls": "TLS-encrypted",
+  "doctorConnPlainLocal": "unencrypted (stays on this machine)",
+  "doctorConnPlainRemote": "unencrypted",
+  "doctorConnToken": "token configured ({count} characters)",
+  "@doctorConnToken": {
+    "placeholders": {
+      "count": {"type": "int"}
+    }
+  },
+  "doctorConnAnonymous": "no token (anonymous)",
+  "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.",
   "doctorPathLog": "Log",
   "doctorPathConfig": "Config",
   "doctorPathDb": "Audit DB",