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/lib/config.ts

@@ -99,6 +99,10 @@ export class Config {
             process.env.MAXMIND_DB_PATH = parsedConfig.server.maxmind_db_path;
         }
 
+        if (parsedConfig.server.maxmind_asn_path) {
+            process.env.MAXMIND_ASN_PATH = parsedConfig.server.maxmind_asn_path;
+        }
+
         this.rawConfig = parsedConfig;
     }