feat(security): add darklist.de source and raise the blocklist cap to 1M

.env.example

@@ -135,7 +135,7 @@ CROWDSEC_LAPI_API_KEY=
 # Expiration for each blocklist decision (re-synced keeps them fresh).
 #CROWDSEC_BLOCKLIST_DURATION=24h
 # Combined cap per sync (safety valve against excessive decisions).
-#CROWDSEC_BLOCKLIST_MAX_DECISIONS=250000
+#CROWDSEC_BLOCKLIST_MAX_DECISIONS=1000000
 # Comma-separated IPs/CIDRs that a sync must always skip (allowlist).
 #CROWDSEC_BLOCKLIST_ALLOW=1.2.3.4,10.0.0.0/8