Add shift templates, unit duty roster grid, and Nursing Services hub.

Phase 3 staff management: real shift entities, week roster linked to temporary assignments, and a nursing ops module surface (registry, today’s allocation, unit shortcuts).

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

app/Models/Shift.php

@@ -0,0 +1,54 @@
+<?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 Shift extends Model
+{
+    use BelongsToOwner, SoftDeletes;
+
+    protected $table = 'care_shifts';
+
+    protected $fillable = [
+        'owner_ref',
+        'organization_id',
+        'code',
+        'label',
+        'start_time',
+        'end_time',
+        'color',
+        'sort_order',
+        'is_active',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'is_active' => 'boolean',
+            'sort_order' => 'integer',
+        ];
+    }
+
+    public function organization(): BelongsTo
+    {
+        return $this->belongsTo(Organization::class, 'organization_id');
+    }
+
+    public function rosterEntries(): HasMany
+    {
+        return $this->hasMany(RosterEntry::class, 'shift_id');
+    }
+
+    public function timeLabel(): string
+    {
+        $start = substr((string) $this->start_time, 0, 5);
+        $end = substr((string) $this->end_time, 0, 5);
+
+        return $start.'–'.$end;
+    }
+}