Phase 1-2: Migrate to Deno with npm: and node: specifiers

- Created deno.json configuration
- Updated all imports to use npm:net-snmp@3.20.0
- Changed all Node.js built-in imports to node: specifiers
- Updated all .js extensions to .ts in imports
- Created mod.ts as Deno entry point
- Ready for Phase 3: CLI simplification

ts/snmp/index.ts

@@ -4,7 +4,7 @@
  */
 
 // Re-export all public types
-export type { IUpsStatus, IOidSet, TUpsModel, ISnmpConfig } from './types.js';
+export type { IUpsStatus, IOidSet, TUpsModel, ISnmpConfig } from './types.ts';
 
 // Re-export the SNMP manager class
-export { NupstSnmp } from './manager.js';
+export { NupstSnmp } from './manager.ts';

ts/snmp/manager.ts

@@ -1,6 +1,6 @@
-import * as snmp from 'net-snmp';
-import type { IOidSet, ISnmpConfig, TUpsModel, IUpsStatus } from './types.js';
-import { UpsOidSets } from './oid-sets.js';
+import * as snmp from "npm:net-snmp@3.20.0";
+import type { IOidSet, ISnmpConfig, TUpsModel, IUpsStatus } from './types.ts';
+import { UpsOidSets } from './oid-sets.ts';
 
 /**
  * Class for SNMP communication with UPS devices

ts/snmp/oid-sets.ts

@@ -1,4 +1,4 @@
-import type { IOidSet, TUpsModel } from './types.js';
+import type { IOidSet, TUpsModel } from './types.ts';
 
 /**
  * OID sets for different UPS models