feat: Body Blocker armor + drug credit deduction on use (v1.4.1)

- Add Body Blocker armor (AR 1, Dice 1, 120c) with custom SVG icon
  Concealable civilian vest, sits between Street Clothes and Downtown Jacket
- _activateDrug now automatically deducts drug cost from actor credits
  Shows notification: drug name, cost charged, old and new credit total
  Credits cannot go below 0
- Set costs on 7 drugs that were missing them (cost was 0):
  Painkillers 30c, Stimulant 40c, Sedative 35c, Redline 110c,
  Calm-Line 65c, Rush 85c, UV 200c
- Rebuild: sla-armors (18), sla-drugs (16)

zero-engine.mjs

@@ -827,6 +827,17 @@ class ZeroEngineActorSheet extends foundry.appv1.sheets.ActorSheet {
       "system.withdrawalActive": false
     });
 
+    // ── Deduct drug cost from credits ────────────────────────────────────────
+    const drugCost = Math.max(0, Number(item.system?.cost) || 0);
+    if (drugCost > 0) {
+      const currentCredits = Number(this.actor.system?.details?.credits ?? 0);
+      const newCredits = Math.max(0, currentCredits - drugCost);
+      await this.actor.update({ "system.details.credits": newCredits });
+      ui.notifications.info(
+        `${item.name}: ${drugCost}¢ charged to ${this.actor.name}. Credits: ${currentCredits} → ${newCredits}`
+      );
+    }
+
     const stressBonus = Math.max(0, Number(item.system?.stressRecoveryBonus) || 0);
     if (stressBonus > 0) {
       const currentStress = this._getStressValue(this.actor);