feat: Provisionner automatiquement un nouvel établissement

Lorsqu'un super-admin crée un établissement via l'interface, le système
doit automatiquement créer la base tenant, exécuter les migrations,
créer le premier utilisateur admin et envoyer l'invitation — le tout
de manière asynchrone pour ne pas bloquer la réponse HTTP.

Ce mécanisme rend chaque établissement opérationnel dès sa création
sans intervention manuelle sur l'infrastructure.

backend/src/Scolarite/Infrastructure/ReadModel/InMemoryTeacherStatisticsReader.php

@@ -0,0 +1,122 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Scolarite\Infrastructure\ReadModel;
+
+use App\Scolarite\Application\Port\TeacherStatisticsReader;
+
+final class InMemoryTeacherStatisticsReader implements TeacherStatisticsReader
+{
+    /** @var list<array{classId: string, className: string, subjectId: string, subjectName: string, evaluationCount: int, studentCount: int, average: float|null, successRate: float|null}> */
+    private array $classesSummary = [];
+
+    /** @var list<float> */
+    private array $classGrades = [];
+
+    /** @var list<array{month: string, average: float}> */
+    private array $monthlyAverages = [];
+
+    /** @var list<array{studentId: string, studentName: string, average: float|null}> */
+    private array $studentAverages = [];
+
+    /** @var list<array{date: string, value: float, evaluationTitle: string}> */
+    private array $gradeHistory = [];
+
+    /** @var list<array{evaluationId: string, title: string, classId: string, className: string, subjectId: string, subjectName: string, date: string, average: float|null, gradedCount: int}> */
+    private array $evaluationDifficulties = [];
+
+    /** @var array<string, list<float>> */
+    private array $studentMonthlyAverages = [];
+
+    /** @var list<float> */
+    private array $otherTeachersAverages = [];
+
+    /** @param list<array{classId: string, className: string, subjectId: string, subjectName: string, evaluationCount: int, studentCount: int, average: float|null, successRate: float|null}> $data */
+    public function feedClassesSummary(array $data): void
+    {
+        $this->classesSummary = $data;
+    }
+
+    /** @param list<float> $grades */
+    public function feedClassGrades(array $grades): void
+    {
+        $this->classGrades = $grades;
+    }
+
+    /** @param list<array{month: string, average: float}> $averages */
+    public function feedMonthlyAverages(array $averages): void
+    {
+        $this->monthlyAverages = $averages;
+    }
+
+    /** @param list<array{studentId: string, studentName: string, average: float|null}> $averages */
+    public function feedStudentAverages(array $averages): void
+    {
+        $this->studentAverages = $averages;
+    }
+
+    /** @param list<array{date: string, value: float, evaluationTitle: string}> $history */
+    public function feedGradeHistory(array $history): void
+    {
+        $this->gradeHistory = $history;
+    }
+
+    /** @param list<array{evaluationId: string, title: string, classId: string, className: string, subjectId: string, subjectName: string, date: string, average: float|null, gradedCount: int}> $difficulties */
+    public function feedEvaluationDifficulties(array $difficulties): void
+    {
+        $this->evaluationDifficulties = $difficulties;
+    }
+
+    /** @param array<string, list<float>> $averages */
+    public function feedStudentMonthlyAverages(array $averages): void
+    {
+        $this->studentMonthlyAverages = $averages;
+    }
+
+    /** @param list<float> $averages */
+    public function feedOtherTeachersAverages(array $averages): void
+    {
+        $this->otherTeachersAverages = $averages;
+    }
+
+    public function teacherClassesSummary(string $teacherId, string $tenantId, string $periodStartDate, string $periodEndDate): array
+    {
+        return $this->classesSummary;
+    }
+
+    public function classGradesNormalized(string $teacherId, string $classId, string $subjectId, string $tenantId, string $periodStartDate, string $periodEndDate): array
+    {
+        return $this->classGrades;
+    }
+
+    public function classMonthlyAverages(string $teacherId, string $classId, string $subjectId, string $tenantId, string $academicYearStart, string $academicYearEnd): array
+    {
+        return $this->monthlyAverages;
+    }
+
+    public function studentAveragesForClass(string $teacherId, string $classId, string $subjectId, string $periodId, string $tenantId): array
+    {
+        return $this->studentAverages;
+    }
+
+    public function studentMonthlyAveragesForClass(string $classId, string $subjectId, string $tenantId, string $academicYearStart, string $academicYearEnd): array
+    {
+        return $this->studentMonthlyAverages;
+    }
+
+    public function studentGradeHistory(string $studentId, string $subjectId, string $classId, string $teacherId, string $tenantId, string $academicYearStart, string $academicYearEnd): array
+    {
+        return $this->gradeHistory;
+    }
+
+    public function teacherEvaluationDifficulties(string $teacherId, string $tenantId): array
+    {
+        return $this->evaluationDifficulties;
+    }
+
+    public function subjectAveragesForOtherTeachers(string $teacherId, string $subjectId, string $tenantId): array
+    {
+        return $this->otherTeachersAverages;
+    }
+}