feat(patients): phase B4 — messages (پیام‌ها)

Add a patient message/communication log: a new PatientMessage entity
(record-scoped, CASCADE) + repository, and owner-scoped endpoints
(GET messages, POST message, DELETE message) with a validated channel
(sms/note/call/email). Wire the "پیام‌ها" tab in PatientDetailPage
(send box + list + delete). PHPUnit covers create/list/delete + ownership
+ validation; Vitest covers the tab. API docs updated.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/Patient/Entity/PatientMessage.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace App\Patient\Entity;
+
+use App\Patient\Repository\PatientMessageRepository;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Uid\Uuid;
+
+/** A logged message/communication with a patient (the «پیام‌ها» tab). */
+#[ORM\Entity(repositoryClass: PatientMessageRepository::class)]
+#[ORM\Table(name: 'patient_messages')]
+#[ORM\Index(columns: ['record_id'], name: 'idx_patient_messages_record')]
+class PatientMessage
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column(type: 'integer')]
+    private ?int $id = null;
+
+    #[ORM\Column(type: 'string', length: 36, unique: true)]
+    private string $uuid;
+
+    #[ORM\ManyToOne(targetEntity: PatientRecord::class)]
+    #[ORM\JoinColumn(name: 'record_id', nullable: false, onDelete: 'CASCADE')]
+    private PatientRecord $record;
+
+    #[ORM\Column(type: 'text')]
+    private string $body;
+
+    /** Channel: sms | note | call | email … */
+    #[ORM\Column(type: 'string', length: 20)]
+    private string $channel = 'sms';
+
+    #[ORM\Column(name: 'created_at', type: 'integer')]
+    private int $createdAt;
+
+    public function __construct(PatientRecord $record, string $body, string $channel = 'sms')
+    {
+        $this->uuid      = Uuid::v4()->toRfc4122();
+        $this->record    = $record;
+        $this->body      = $body;
+        $this->channel   = $channel;
+        $this->createdAt = time();
+    }
+
+    public function getId(): ?int              { return $this->id; }
+    public function getUuid(): string          { return $this->uuid; }
+    public function getRecord(): PatientRecord { return $this->record; }
+
+    public function toArray(): array
+    {
+        return [
+            'uuid'       => $this->uuid,
+            'body'       => $this->body,
+            'channel'    => $this->channel,
+            'created_at' => $this->createdAt,
+        ];
+    }
+}