Add ASN-based resource rule matching

- Add MaxMind ASN database integration
- Implement ASN lookup and matching in resource rule verification
- Add curated list of 100+ major ASNs (cloud, ISP, CDN, mobile carriers)
- Add ASN dropdown selector in resource rules UI with search functionality
- Support custom ASN input for unlisted ASNs
- Add 'ALL ASNs' special case handling (AS0)
- Cache ASN lookups with 5-minute TTL for performance
- Update validation schemas to support ASN match type

This allows administrators to create resource access rules based on
Autonomous System Numbers, similar to existing country-based rules.
Useful for restricting access by ISP, cloud provider, or mobile carrier.

server/db/maxmindAsn.ts

@@ -0,0 +1,13 @@
+import maxmind, { AsnResponse, Reader } from "maxmind";
+import config from "@server/lib/config";
+
+let maxmindAsnLookup: Reader<AsnResponse> | null;
+if (config.getRawConfig().server.maxmind_asn_path) {
+    maxmindAsnLookup = await maxmind.open<AsnResponse>(
+        config.getRawConfig().server.maxmind_asn_path!
+    );
+} else {
+    maxmindAsnLookup = null;
+}
+
+export { maxmindAsnLookup };