Fix K8s deployment crash: ensure DB directory exists on startup

init_db() now creates the parent directory for the SQLite database
file before connecting. Also sets HAPROXY_DB_FILE in the K8s
deployment to /app/data/ since the container doesn't have
/opt/haproxy/conf/.

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

haproxy_mcp/db.py

@@ -63,6 +63,11 @@ def init_db() -> None:
     Creates tables if they don't exist, then checks for existing
     JSON/map files to migrate data from.
     """
+    # Ensure parent directory exists for the database file
+    db_dir = os.path.dirname(DB_FILE)
+    if db_dir:
+        os.makedirs(db_dir, exist_ok=True)
+
     conn = get_connection()
     cur = conn.cursor()