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/readConfigFile.ts

@@ -133,7 +133,8 @@ export const configSchema = z
                     .optional(),
                 trust_proxy: z.int().gte(0).optional().default(1),
                 secret: z.string().pipe(z.string().min(8)).optional(),
-                maxmind_db_path: z.string().optional()
+                maxmind_db_path: z.string().optional(),
+                maxmind_asn_path: z.string().optional()
             })
             .optional()
             .default({