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>

cli/src/commands/configure.ts

@@ -63,6 +63,9 @@ function defaultConfig(): PaperclipConfig {
       baseUrlMode: "auto",
       disableSignUp: false,
     },
+    telemetry: {
+      enabled: true,
+    },
     storage: defaultStorageConfig(),
     secrets: defaultSecretsConfig(),
   };