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/telemetry.ts

@@ -0,0 +1,29 @@
+import path from "node:path";
+import {
+  TelemetryClient,
+  resolveTelemetryConfig,
+  loadOrCreateState,
+} from "@paperclipai/shared/telemetry";
+import { resolvePaperclipInstanceRoot } from "./home-paths.js";
+import { serverVersion } from "./version.js";
+
+let client: TelemetryClient | null = null;
+
+export function initTelemetry(fileConfig?: { enabled?: boolean }): TelemetryClient | null {
+  if (client) return client;
+
+  const config = resolveTelemetryConfig(fileConfig);
+  if (!config.enabled) return null;
+
+  const stateDir = path.join(resolvePaperclipInstanceRoot(), "telemetry");
+  client = new TelemetryClient(
+    config,
+    () => loadOrCreateState(stateDir, serverVersion),
+    serverVersion,
+  );
+  return client;
+}
+
+export function getTelemetryClient(): TelemetryClient | null {
+  return client;
+}