feat: production-grade routing cache + stale detection fixes

Three-tier routing cache (ESL global -> file -> HTTP) eliminates HTTP
from call path for 2500-5000 concurrent calls. Lua reads cached route
in ~0.1us instead of blocking on api:execute('curl', ...).

Engine fixes:
- recalcBestLocked now skips stale nodes (was 5 min bug -> now ~10-15s)
- PickNodeForCall action_type='node' checks staleness for consistency
- onMetric callback pushes cache on every metric (no ticker delay)

Config:
- stale_threshold_sec default 20 -> 10 (industry standard)
- contrib/ included in Makefile deploy target
- route.lua paths updated for /opt/pulse-lets-go

Makefile

@@ -53,14 +53,16 @@ build-prod:
 # Деплой в PREFIX: бинарник + статика + data + log
 deploy: build-prod
 	@echo "→ Деплой в $(PREFIX)"
-	install -d $(PREFIX)/bin $(PREFIX)/data $(PREFIX)/web $(PREFIX)/log
+	install -d $(PREFIX)/bin $(PREFIX)/data $(PREFIX)/web $(PREFIX)/log $(PREFIX)/contrib
 	install -m 755 $(BINDIR)/$(APP) $(PREFIX)/bin/
 	cp -r $(WEB_DIR)/build/. $(PREFIX)/web/
+	cp contrib/*.lua contrib/*.json $(PREFIX)/contrib/ 2>/dev/null || true
 	@echo "✓ Готово: $(PREFIX)"
 	@echo "  $(PREFIX)/bin/$(APP)"
 	@echo "  $(PREFIX)/web/ (SvelteKit статика)"
 	@echo "  $(PREFIX)/data/ (config.json, trunks.json, users.json)"
 	@echo "  $(PREFIX)/log/ (ASCII-лог метрик)"
+	@echo "  $(PREFIX)/contrib/ (route.lua, конфиги агентов)"
 
 # Установка systemd unit
 install-systemd: