Add Lab and Blood Bank manager roles with admin UIs.

Give lab_manager catalog/ops admin access and blood_bank_manager a branch-level stock register plus specialty admin surface, while keeping technicians on clinical queues.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Models/BloodBankStock.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Models;
+
+use App\Models\Concerns\BelongsToOwner;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class BloodBankStock extends Model
+{
+    use BelongsToOwner;
+
+    protected $table = 'care_blood_bank_stock';
+
+    protected $fillable = [
+        'owner_ref',
+        'organization_id',
+        'branch_id',
+        'product_code',
+        'product_label',
+        'units_on_hand',
+        'reorder_level',
+        'notes',
+        'updated_by',
+    ];
+
+    public function organization(): BelongsTo
+    {
+        return $this->belongsTo(Organization::class, 'organization_id');
+    }
+
+    public function branch(): BelongsTo
+    {
+        return $this->belongsTo(Branch::class, 'branch_id');
+    }
+
+    public function isLowStock(): bool
+    {
+        return (int) $this->units_on_hand <= (int) $this->reorder_level;
+    }
+}