feat(sync): /api/sync/health endpoint + dashboard health pill + MALFORMED UI

Backend:
- GET /api/sync/health returns {last_sync_at, last_sync_status,
  last_halt_reason, recent_phase_failures, escalation_phase, is_healthy}.
  healthy when last run was completed (or none yet), no phase has
  tripped the 3-in-a-row escalation, and recent failures <= 1.
- Dashboard + run-level endpoints include `malformed` count so the
  Defecte pill can render.

Frontend:
- Health pill in .sync-card-controls with three states — healthy
  (success green, check icon), warning (amber, triangle), escalated
  (error red, x-octagon + glow). Tooltip exposes the halt reason and
  the top phases with recent failures.
- Status-dot + badge add MALFORMED treatment via --compare orange,
  distinct from ERROR red. DESIGN.md notes the diagnostic rationale
  (ERROR = runtime, MALFORMED = payload source issue).
- Defecte filter pill on dashboard + logs pages. Mobile segmented
  control includes Defecte count. Counts wired to the malformed key.
- startSync() shows a native confirm modal when state is
  halted_escalation — operator override still possible, not silenced.
- ORDER_STATUS.MALFORMED mirror added to shared.js.
- Cache-bust: style.css v46, shared.js v47, dashboard.js v52,
  logs.js v16.

5 endpoint tests cover empty state, completed, failed, escalated,
single-failure warning. Full CI: 257 unit + 33 e2e green.

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

api/app/templates/logs.html

@@ -63,6 +63,7 @@
         <button class="filter-pill d-none d-md-inline-flex" data-log-status="{{ OrderStatus.ALREADY_IMPORTED.value }}">Deja imp. <span class="filter-count fc-blue" id="countAlreadyImported">0</span></button>
         <button class="filter-pill d-none d-md-inline-flex" data-log-status="{{ OrderStatus.SKIPPED.value }}">Omise <span class="filter-count fc-yellow" id="countSkipped">0</span></button>
         <button class="filter-pill d-none d-md-inline-flex" data-log-status="{{ OrderStatus.ERROR.value }}">Erori <span class="filter-count fc-red" id="countError">0</span></button>
+        <button class="filter-pill d-none d-md-inline-flex" data-log-status="{{ OrderStatus.MALFORMED.value }}">Defecte <span class="filter-count fc-orange" id="countMalformed">0</span></button>
     </div>
     <div class="d-md-none mb-2" id="logsMobileSeg" style="overflow-x:auto"></div>
 
@@ -109,5 +110,5 @@
 {% endblock %}
 
 {% block scripts %}
-<script src="{{ request.scope.get('root_path', '') }}/static/js/logs.js?v=15"></script>
+<script src="{{ request.scope.get('root_path', '') }}/static/js/logs.js?v=16"></script>
 {% endblock %}