Phase 0 : entités, migrations, API Platform, PostGIS

- API Platform + Doctrine ORM + jsor/doctrine-postgis installés
- 6 entités Symfony (SargassumObservation, SargassumForecast,
  DataIngestionJob, CoastalPoint, ImpactScore, UserFeedback)
- Migration initiale manuelle avec CREATE EXTENSION postgis,
  toutes les tables, index GIST et BTREE
- doctrine.yaml configuré pour PostgreSQL 16 + types PostGIS
- Roadmap Phase 0 complète

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/Entity/UserFeedback.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Entity;
+
+use App\Repository\UserFeedbackRepository;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\Doctrine\Types\UuidType;
+use Symfony\Component\Uid\Uuid;
+
+#[ORM\Entity(repositoryClass: UserFeedbackRepository::class)]
+#[ORM\Index(columns: ['timestamp'], name: 'idx_feedback_timestamp')]
+class UserFeedback
+{
+    #[ORM\Id]
+    #[ORM\Column(type: UuidType::NAME, unique: true)]
+    #[ORM\GeneratedValue(strategy: 'CUSTOM')]
+    #[ORM\CustomIdGenerator(class: 'doctrine.uuid_generator')]
+    private ?Uuid $id = null;
+
+    #[ORM\Column(type: 'geometry', options: ['geometry_type' => 'POINT', 'srid' => 4326])]
+    private mixed $location = null;
+
+    #[ORM\ManyToOne(inversedBy: 'feedbacks')]
+    #[ORM\JoinColumn(nullable: true)]
+    private ?CoastalPoint $coastalPoint = null;
+
+    #[ORM\Column]
+    private ?\DateTimeImmutable $timestamp = null;
+
+    #[ORM\Column]
+    private ?bool $hasSeaweed = null;
+
+    #[ORM\Column(length: 20, nullable: true)]
+    private ?string $density = null;
+
+    #[ORM\Column(length: 100, nullable: true)]
+    private ?string $source = null;
+
+    public function __construct()
+    {
+        $this->timestamp = new \DateTimeImmutable();
+    }
+
+    public function getId(): ?Uuid { return $this->id; }
+    public function getLocation(): mixed { return $this->location; }
+    public function setLocation(mixed $location): static { $this->location = $location; return $this; }
+    public function getCoastalPoint(): ?CoastalPoint { return $this->coastalPoint; }
+    public function setCoastalPoint(?CoastalPoint $coastalPoint): static { $this->coastalPoint = $coastalPoint; return $this; }
+    public function getTimestamp(): ?\DateTimeImmutable { return $this->timestamp; }
+    public function setTimestamp(\DateTimeImmutable $timestamp): static { $this->timestamp = $timestamp; return $this; }
+    public function getHasSeaweed(): ?bool { return $this->hasSeaweed; }
+    public function setHasSeaweed(bool $hasSeaweed): static { $this->hasSeaweed = $hasSeaweed; return $this; }
+    public function getDensity(): ?string { return $this->density; }
+    public function setDensity(?string $density): static { $this->density = $density; return $this; }
+    public function getSource(): ?string { return $this->source; }
+    public function setSource(?string $source): static { $this->source = $source; return $this; }
+}