baldar-api — token-auth read-only access to BaldarSQL
GET  /health                     — liveness (no auth)
GET  /db-health                  — DB reachability (auth)
POST /api/v1/query               — { db?, query }  SELECT-only
GET  /api/v1/databases           — DBs + tables + row counts
GET  /api/v1/schema/:db/:table   — column list
GET  /api/v1/sample/:db/:table   — TOP 5 rows