feat: Setup projet Classeo avec infrastructure Docker et architecture DDD

Configure l'environnement de développement complet avec Docker Compose,
structure DDD 4 Bounded Contexts, et pipeline CI/CD GitHub Actions.

Corrections compatibilité CI:
- Symfony 8 nécessite monolog-bundle ^4.0 (la v3.x ne supporte que jusqu'à Symfony 7)
- ESLint v9 nécessite flat config (eslint.config.js) - le format .eslintrc.cjs est obsolète

scripts/check-bc-isolation.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+# =============================================================================
+# Bounded Context Isolation Check
+# Ensures Domain layer has no framework dependencies
+# =============================================================================
+
+set -e
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+NC='\033[0m' # No Color
+
+ERRORS=0
+
+echo "Checking Bounded Context isolation..."
+echo ""
+
+# Define forbidden imports in Domain layer
+FORBIDDEN_PATTERNS=(
+    "use Symfony\\\\"
+    "use Doctrine\\\\"
+    "use ApiPlatform\\\\"
+    "use Lexik\\\\"
+    "#\[ORM\\\\"
+    "#\[ApiResource"
+    "#\[Assert\\\\"
+)
+
+# Check each BC Domain folder
+for BC in Administration Scolarite VieScolaire Communication; do
+    DOMAIN_PATH="backend/src/${BC}/Domain"
+
+    if [ -d "$DOMAIN_PATH" ]; then
+        echo "Checking ${BC}/Domain..."
+
+        for pattern in "${FORBIDDEN_PATTERNS[@]}"; do
+            # Use grep with -r for recursive, -n for line numbers
+            if grep -rn "$pattern" "$DOMAIN_PATH" 2>/dev/null; then
+                echo -e "${RED}ERROR: Found forbidden import pattern '$pattern' in ${BC}/Domain${NC}"
+                ERRORS=$((ERRORS + 1))
+            fi
+        done
+    fi
+done
+
+# Check Shared/Domain as well
+SHARED_DOMAIN="backend/src/Shared/Domain"
+if [ -d "$SHARED_DOMAIN" ]; then
+    echo "Checking Shared/Domain..."
+
+    for pattern in "${FORBIDDEN_PATTERNS[@]}"; do
+        if grep -rn "$pattern" "$SHARED_DOMAIN" 2>/dev/null; then
+            echo -e "${RED}ERROR: Found forbidden import pattern '$pattern' in Shared/Domain${NC}"
+            ERRORS=$((ERRORS + 1))
+        fi
+    done
+fi
+
+echo ""
+if [ $ERRORS -gt 0 ]; then
+    echo -e "${RED}BC Isolation check FAILED with $ERRORS error(s)${NC}"
+    echo "Domain layer must be pure PHP without framework dependencies."
+    exit 1
+else
+    echo -e "${GREEN}BC Isolation check PASSED${NC}"
+    exit 0
+fi