feat: add devices handler with stub implementation

src/handlers/devices.rs

@@ -0,0 +1,18 @@
+use axum::Json;
+use serde_json::{json, Value};
+
+/// GET /devices
+///
+/// Returns an empty list of devices.
+/// Device tracking is not implemented in this minimal Bitwarden-compatible server.
+/// This does not affect authentication since we use stateless JWT tokens.
+/// Clients will show "No devices currently logged in" in the device management settings.
+#[worker::send]
+pub async fn get_devices() -> Json<Value> {
+    Json(json!({
+        "data": [],
+        "continuationToken": null,
+        "object": "list"
+    }))
+}
+

src/handlers/mod.rs

@@ -1,6 +1,7 @@
 pub mod accounts;
 pub mod ciphers;
 pub mod config;
+pub mod devices;
 pub mod emergency_access;
 pub mod folders;
 pub mod identity;

src/router.rs

@@ -5,7 +5,7 @@ use axum::{
 use std::sync::Arc;
 use worker::Env;
 
-use crate::handlers::{accounts, ciphers, config, emergency_access, folders, identity, import, sync, webauth};
+use crate::handlers::{accounts, ciphers, config, devices, emergency_access, folders, identity, import, sync, webauth};
 
 pub fn api_router(env: Env) -> Router {
     let app_state = Arc::new(env);
@@ -78,6 +78,8 @@ pub fn api_router(env: Env) -> Router {
             "/api/emergency-access/granted",
             get(emergency_access::get_granted_access),
         )
+        // Devices (stub - returns empty list, device tracking not implemented)
+        .route("/api/devices", get(devices::get_devices))
         // WebAuthn (stub - prevents 404 errors, passkeys not supported)
         .route(
             "/api/webauthn",