fix(spells): backfill casting times for all imported spells

data/spells/ill_omen.json

@@ -5,6 +5,7 @@
   "range": "close",
   "save": "none",
   "base_dc": 10,
+  "cast_time": "standard",
   "effects": [],
   "description": "The target is afflicted with bad luck: on its next d20 roll (one per 5 caster levels, up to five) it must roll twice and take the less favorable result; duration 1 round/level. No saving throw; spell resistance applies. The forced worst-of-two reroll mechanic is not modeled by the engine, so the spell has no mechanical effects here."
 }