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/CareUnit.php

@@ -0,0 +1,76 @@
+<?php
+
+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;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class CareUnit extends Model
+{
+    use BelongsToOwner, SoftDeletes;
+
+    protected $table = 'care_care_units';
+
+    protected $fillable = [
+        'owner_ref',
+        'organization_id',
+        'department_id',
+        'name',
+        'code',
+        'kind',
+        'is_active',
+        'sort_order',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'is_active' => 'boolean',
+            'sort_order' => 'integer',
+        ];
+    }
+
+    public function organization(): BelongsTo
+    {
+        return $this->belongsTo(Organization::class, 'organization_id');
+    }
+
+    public function department(): BelongsTo
+    {
+        return $this->belongsTo(Department::class, 'department_id');
+    }
+
+    public function beds(): HasMany
+    {
+        return $this->hasMany(Bed::class, 'care_unit_id')->orderBy('sort_order')->orderBy('label');
+    }
+
+    public function assignments(): HasMany
+    {
+        return $this->hasMany(StaffAssignment::class, 'care_unit_id');
+    }
+
+    public function supportsBeds(): bool
+    {
+        return $this->kind === 'inpatient';
+    }
+
+    public function labelForSelect(): string
+    {
+        $dept = $this->relationLoaded('department')
+            ? $this->department
+            : $this->department()->first();
+
+        $kindLabel = config('care.care_unit_kinds.'.$this->kind, $this->kind);
+        $base = $this->name.($kindLabel ? ' ('.$kindLabel.')' : '');
+
+        if ($dept?->name) {
+            return $dept->name.' — '.$base;
+        }
+
+        return $base;
+    }
+}