feat: implement app-side telemetry sender

Add the shared telemetry sender, wire the CLI/server emit points,
and cover the config and completion behavior with tests.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/config.ts

@@ -75,6 +75,7 @@ export interface Config {
   heartbeatSchedulerEnabled: boolean;
   heartbeatSchedulerIntervalMs: number;
   companyDeletionEnabled: boolean;
+  telemetryEnabled: boolean;
 }
 
 export function loadConfig(): Config {
@@ -267,5 +268,6 @@ export function loadConfig(): Config {
     heartbeatSchedulerEnabled: process.env.HEARTBEAT_SCHEDULER_ENABLED !== "false",
     heartbeatSchedulerIntervalMs: Math.max(10000, Number(process.env.HEARTBEAT_SCHEDULER_INTERVAL_MS) || 30000),
     companyDeletionEnabled,
+    telemetryEnabled: fileConfig?.telemetry?.enabled ?? true,
   };
 }