feat(evaluations): bulk approve evaluation tests with 4-step confirmation modal

Backend:
- POST /system/attck-evaluations/bulk-approve: finds all [EVAL R*] tests in
  in_review state, approves blue side, transitions to validated, recalculates
  technique statuses, audit logs each test
- GET /system/attck-evaluations/pending-count: returns count of pending eval tests

Frontend:
- BulkApproveModal: 4 mandatory checkboxes before confirm button enables
  (lab env / not org detection / metrics impact / spot-check recommendation)
- Bulk Approve button in header badge showing pending count
- Green result banner showing approved tests + techniques recalculated
- Invalidates techniques, metrics and review-queue queries on success

frontend/src/api/system.ts

@@ -102,3 +102,21 @@ export async function checkNewEvaluationRound(): Promise<NewRoundCheckResult> {
   const { data } = await client.get<NewRoundCheckResult>("/system/attck-evaluations/check-new");
   return data;
 }
+
+export interface BulkApproveResult {
+  approved: number;
+  techniques_recalculated: number;
+  message: string;
+}
+
+/** Bulk-approve all in-review evaluation tests (Blue Team side). */
+export async function bulkApproveEvaluationTests(): Promise<BulkApproveResult> {
+  const { data } = await client.post<BulkApproveResult>("/system/attck-evaluations/bulk-approve");
+  return data;
+}
+
+/** Get the count of evaluation tests still awaiting Blue approval. */
+export async function getEvalPendingCount(): Promise<{ pending: number }> {
+  const { data } = await client.get<{ pending: number }>("/system/attck-evaluations/pending-count");
+  return data;
+}