Show readable summaries instead of raw JSON in the audit log

Task #94: Each admin audit log row now renders a localized one-line
summary derived from the entry's action + metadata, e.g.
"Deleted group 'audit-test-group'" or "تم حذف المجموعة 'X'", instead
of just showing the raw target type/id.

Implementation
- Added `formatAuditSummary(entry, t, lang)` in
  `artifacts/tx-os/src/pages/admin.tsx` covering all known audit
  actions emitted by the API (group/user/role/app/service/settings/
  auth create/update/delete/permission/membership variants, including
  forced deletions). Returns null for unknown actions so the row
  gracefully falls back to the existing "Target: type #id" display.
- The summary now occupies the prominent text slot in `AuditLogRow`.
  The raw action code stays in the small badge (it is also the value
  the action-filter dropdown uses), and the timestamp moved next to
  it. The expand toggle still reveals the full JSON metadata for
  power users (data-testid `audit-metadata-<id>` unchanged).
- Added `admin.audit.summary.*` keys plus a pluralized
  `admin.audit.unit.*` helper map in en.json and ar.json. The Arabic
  unit keys provide all six CLDR plural forms (zero/one/two/few/
  many/other) so counts read naturally; English uses one/other.

Verification
- `tsc --build` clean for the tx-os artifact.
- e2e test (admin login → create + delete a uniquely named group →
  open Audit Log → confirm Arabic and English summaries render,
  raw JSON is still available behind the toggle, and the action pill
  still shows the raw action code) passed.

Follow-up proposed
- #117 "Show readable action names in the audit log filter dropdown"
  (the filter dropdown still lists raw action codes).

Replit-Task-Id: b47aacde-087e-4a2b-8fb2-0e63cb1936e4

artifacts/tx-os/src/locales/en.json

@@ -490,6 +490,72 @@
         "invalidDate": "Dates must be in YYYY-MM-DD format.",
         "invertedDates": "\"From\" date must be on or before \"To\" date.",
         "fixFiltersFirst": "Adjust the filters to load entries."
+      },
+      "unit": {
+        "member_one": "{{count}} member",
+        "member_other": "{{count}} members",
+        "app_one": "{{count}} app",
+        "app_other": "{{count}} apps",
+        "role_one": "{{count}} role",
+        "role_other": "{{count}} roles",
+        "group_one": "{{count}} group",
+        "group_other": "{{count}} groups",
+        "order_one": "{{count}} order",
+        "order_other": "{{count}} orders",
+        "change_one": "{{count}} change",
+        "change_other": "{{count}} changes",
+        "permission_one": "{{count}} permission",
+        "permission_other": "{{count}} permissions",
+        "restriction_one": "{{count}} restriction",
+        "restriction_other": "{{count}} restrictions",
+        "note_one": "{{count}} note",
+        "note_other": "{{count}} notes",
+        "conversation_one": "{{count}} conversation",
+        "conversation_other": "{{count}} conversations",
+        "message_one": "{{count}} message",
+        "message_other": "{{count}} messages"
+      },
+      "summary": {
+        "app": {
+          "create": "Created app '{{name}}'",
+          "update": "Updated app '{{name}}' ({{changes}})",
+          "delete": "Deleted app '{{name}}'",
+          "forceDelete": "Force-deleted app '{{name}}' (affected {{groups}})"
+        },
+        "auth": {
+          "issueResetLink": "Issued password reset link for @{{username}}"
+        },
+        "group": {
+          "create": "Created group '{{name}}' ({{members}}, {{apps}})",
+          "update": "Updated group '{{name}}' ({{changes}})",
+          "delete": "Deleted group '{{name}}'",
+          "forceDelete": "Force-deleted group '{{name}}' ({{members}})",
+          "userAdd": "Added user #{{userId}} to group '{{name}}'",
+          "userRemove": "Removed user #{{userId}} from group '{{name}}'",
+          "appAdd": "Added app #{{appId}} to group '{{name}}'",
+          "appRemove": "Removed app #{{appId}} from group '{{name}}'",
+          "roleAdd": "Added role #{{roleId}} to group '{{name}}'",
+          "roleRemove": "Removed role #{{roleId}} from group '{{name}}'"
+        },
+        "role": {
+          "create": "Created role '{{name}}'",
+          "update": "Updated role '{{name}}' ({{changes}})",
+          "rename": "Renamed role '{{previousName}}' to '{{name}}'",
+          "delete": "Deleted role '{{name}}'",
+          "permissionsReplace": "Updated permissions for role '{{name}}' (added {{added}}, removed {{removed}})",
+          "permissionAdd": "Added permission '{{permission}}' to role '{{name}}'",
+          "permissionRemove": "Removed permission '{{permission}}' from role '{{name}}'"
+        },
+        "service": {
+          "forceDelete": "Force-deleted service '{{name}}' (affected {{orders}})"
+        },
+        "settings": {
+          "update": "Updated system settings ({{changes}})"
+        },
+        "user": {
+          "delete": "Deleted user @{{username}}",
+          "forceDelete": "Force-deleted user @{{username}}"
+        }
       }
     },
     "dashboardSoon": "Dashboard widgets coming soon.",