Add Care Units, beds, and dated staff assignments.

Models employment as department/unit/shift placements with primary and temporary kinds so nurses are not permanently bound to a ward.

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

app/Models/Member.php

@@ -5,6 +5,7 @@ namespace App\Models;
 use App\Models\Concerns\BelongsToOwner;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Member extends Model
 {
@@ -24,6 +25,11 @@ class Member extends Model
         return $this->belongsTo(Branch::class, 'branch_id');
     }
 
+    public function staffAssignments(): HasMany
+    {
+        return $this->hasMany(StaffAssignment::class, 'member_id');
+    }
+
     public function hasRole(string ...$roles): bool
     {
         return in_array($this->role, $roles, true);