feat(docker): migrations sqlx intégrées dans le démarrage de l'API

- Déplace les migrations du service `migrate` séparé vers un entrypoint.sh
- L'API exécute `sqlx migrate run` au démarrage avant de lancer le binaire
- Gestion de la rétrocompatibilité : détecte un schéma pre-sqlx et crée
  une baseline `_sqlx_migrations` pour éviter les conflits sur les instances existantes
- Installe sqlx-cli dans le builder, copie le binaire et les migrations dans l'image finale
- Supprime le service `migrate` du docker-compose.yml ; l'indexer dépend maintenant
  du healthcheck de l'API (qui garantit que les migrations sont appliquées)

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

apps/api/entrypoint.sh

@@ -0,0 +1,63 @@
+#!/bin/sh
+set -e
+
+# psql requires "postgresql://" but Rust/sqlx accepts both "postgres://" and "postgresql://"
+PSQL_URL=$(echo "$DATABASE_URL" | sed 's|^postgres://|postgresql://|')
+
+# Check 1: does the old schema exist (index_jobs table)?
+HAS_OLD_TABLES=$(psql "$PSQL_URL" -tAc \
+    "SELECT EXISTS(SELECT 1 FROM information_schema.tables WHERE table_name='index_jobs')::text" \
+    2>/dev/null || echo "false")
+
+# Check 2: is sqlx tracking present and non-empty?
+HAS_SQLX_TABLE=$(psql "$PSQL_URL" -tAc \
+    "SELECT EXISTS(SELECT 1 FROM information_schema.tables WHERE table_name='_sqlx_migrations')::text" \
+    2>/dev/null || echo "false")
+
+if [ "$HAS_SQLX_TABLE" = "true" ]; then
+    HAS_SQLX_ROWS=$(psql "$PSQL_URL" -tAc \
+        "SELECT EXISTS(SELECT 1 FROM _sqlx_migrations LIMIT 1)::text" \
+        2>/dev/null || echo "false")
+else
+    HAS_SQLX_ROWS="false"
+fi
+
+echo "==> Migration check: old_tables=$HAS_OLD_TABLES sqlx_table=$HAS_SQLX_TABLE sqlx_rows=$HAS_SQLX_ROWS"
+
+if [ "$HAS_OLD_TABLES" = "true" ] && [ "$HAS_SQLX_ROWS" = "false" ]; then
+    echo "==> Upgrade from pre-sqlx migration system detected: creating baseline..."
+
+    psql "$PSQL_URL" -c "
+        CREATE TABLE IF NOT EXISTS _sqlx_migrations (
+            version          BIGINT      PRIMARY KEY,
+            description      TEXT        NOT NULL,
+            installed_on     TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+            success          BOOLEAN     NOT NULL,
+            checksum         BYTEA       NOT NULL,
+            execution_time   BIGINT      NOT NULL
+        )
+    "
+
+    for f in /app/migrations/*.sql; do
+        filename=$(basename "$f")
+        # Strip leading zeros to get the integer version (e.g. "0005" -> "5")
+        version=$(echo "$filename" | sed 's/^0*//' | cut -d'_' -f1)
+        description=$(echo "$filename" | sed 's/^[0-9]*_//' | sed 's/\.sql$//')
+        checksum=$(sha384sum "$f" | awk '{print $1}')
+
+        psql "$PSQL_URL" -c "
+            INSERT INTO _sqlx_migrations (version, description, installed_on, success, checksum, execution_time)
+            VALUES ($version, '$description', NOW(), TRUE, decode('$checksum', 'hex'), 0)
+            ON CONFLICT (version) DO NOTHING
+        "
+        echo "    baselined: $filename"
+    done
+
+    echo "==> Baseline complete."
+fi
+
+echo "==> Running migrations..."
+sqlx migrate run --source /app/migrations
+
+echo "==> Starting API..."
+exec /usr/local/bin/api