v1.7.0: Add 5 GM tool windows (Credit Distribution, Shift Ledger, NPC Threat Board, BPN Tracker, Condition Applicator)

- SLACreditDistributionTool: per-PC credit table, bulk pay, deduct expenses
- SLAShiftLedger: full finance breakdown per PC, process shift, export to chat
- SLANPCThreatBoard: filterable NPC grid with health bars, threat ratings, inline HP edit
- SLABPNTracker: BPN mission cards grouped by code, pay out rewards, assign BPN
- SLAConditionApplicator: two-panel toggle UI to apply/remove conditions across PCs
- All tools wired into scene controls (tokens group) and Actor Directory header
- Version bump 1.6.5 -> 1.7.0

system.json

@@ -2,7 +2,7 @@
   "id": "zero-engine",
   "title": "Zero Engine (SLA Industries)",
   "description": "A basic game system for SLA Industries using the Zero Engine rules.",
-  "version": "1.6.5",
+  "version": "1.7.0",
   "compatibility": {
     "minimum": 13,
     "verified": "14.359"