feat(allocation): implement resource allocation feature

- Add AllocationController with CRUD + bulk endpoints
- Add AllocationValidationService for capacity/estimate validation
- Add AllocationMatrixService for optimized matrix queries
- Add AllocationPolicy for authorization
- Add AllocationResource for API responses
- Add frontend allocationService and matrix UI
- Add E2E tests for allocation matrix (20 tests)
- Add unit tests for validation service and policies
- Fix month format conversion (YYYY-MM to YYYY-MM-01)

backend/tests/Unit/Services/CapacityServiceTest.php

@@ -539,3 +539,39 @@ test('4.1.39 Holiday created after initial calculation needs cache invalidation'
 
     expect($result2['person_days'])->toBe(19.0);
 });
+
+test('1.5 batchUpsertAvailability upserts all entries and flushes cache once', function () {
+    $role = Role::factory()->create();
+    $member1 = TeamMember::factory()->create(['role_id' => $role->id]);
+    $member2 = TeamMember::factory()->create(['role_id' => $role->id]);
+
+    $service = app(CapacityService::class);
+
+    $updates = [
+        ['team_member_id' => $member1->id, 'date' => '2026-02-03', 'availability' => 0.5],
+        ['team_member_id' => $member1->id, 'date' => '2026-02-04', 'availability' => 0],
+        ['team_member_id' => $member2->id, 'date' => '2026-02-05', 'availability' => 1],
+    ];
+
+    $count = $service->batchUpsertAvailability($updates, '2026-02');
+
+    expect($count)->toBe(3);
+
+    $this->assertDatabaseHas('team_member_daily_availabilities', [
+        'team_member_id' => $member1->id,
+        'date' => '2026-02-03 00:00:00',
+        'availability' => 0.5,
+    ]);
+
+    $this->assertDatabaseHas('team_member_daily_availabilities', [
+        'team_member_id' => $member1->id,
+        'date' => '2026-02-04 00:00:00',
+        'availability' => 0,
+    ]);
+
+    $this->assertDatabaseHas('team_member_daily_availabilities', [
+        'team_member_id' => $member2->id,
+        'date' => '2026-02-05 00:00:00',
+        'availability' => 1,
+    ]);
+});