feat: switch to a central singleton handler

This also adds support for Headscale TLS installations

server/context/app.ts

@@ -1,22 +1,11 @@
-import type { HostInfo } from '~/types';
-import { TimedCache } from '~server/ws/cache';
-import { hp_agentRequest, hp_getAgentCache } from '~server/ws/data';
-import { hp_getAgents } from '~server/ws/socket';
-import { hp_getConfig } from './loader';
-import type { HeadplaneConfig } from './parser';
+import { hp_agentRequest } from '~server/ws/data';
 
 export interface AppContext {
-	context: HeadplaneConfig;
 	hp_agentRequest: typeof hp_agentRequest;
-	agents: string[];
-	agentData?: TimedCache<HostInfo>;
 }
 
 export default function appContext(): AppContext {
 	return {
-		context: hp_getConfig(),
 		hp_agentRequest,
-		agents: [...hp_getAgents().keys()],
-		agentData: hp_getAgentCache(),
 	};
 }