rename posterg → xamxam throughout: nginx conf, scripts, PHP source, docs

scripts/migrate.sh

@@ -2,14 +2,14 @@
 # Initialise the Post-ERG SQLite database from schema.sql.
 # Safe to run on existing databases — schema uses IF NOT EXISTS / INSERT OR IGNORE.
 # Usage:
-#   scripts/migrate.sh              # posterg.db (default)
+#   scripts/migrate.sh              # xamxam.db (default)
 
 set -euo pipefail
 
 REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
 APP_DIR="$REPO_ROOT/app"
 SCHEMA="$APP_DIR/storage/schema.sql"
-PROD_DB="$APP_DIR/storage/posterg.db"
+PROD_DB="$APP_DIR/storage/xamxam.db"
 
 init_db() {
     local db="$1"
@@ -19,4 +19,4 @@ init_db() {
     echo "  [$label] done"
 }
 
-init_db "$PROD_DB" "posterg.db"
+init_db "$PROD_DB" "xamxam.db"