Wire device execution mode controls into UI

src/app/api/v1/devices/[deviceId]/route.ts

@@ -1,6 +1,6 @@
 import { NextRequest, NextResponse } from "next/server";
 import { requireRequestSession } from "@/lib/boss-auth";
-import { updateDevice } from "@/lib/boss-data";
+import { applyProjectConflictDecision, updateDevice } from "@/lib/boss-data";
 
 export async function PATCH(
   request: NextRequest,
@@ -19,9 +19,33 @@ export async function PATCH(
     endpoint?: string;
     note?: string;
     projects?: string[];
+    capabilities?: {
+      gui?: {
+        connected?: boolean;
+        lastSeenAt?: string;
+        lastActiveProjectId?: string;
+      };
+      cli?: {
+        connected?: boolean;
+        lastSeenAt?: string;
+        lastActiveProjectId?: string;
+      };
+    };
+    preferredExecutionMode?: "gui" | "cli";
+    projectId?: string;
+    folderKey?: string;
+    conflictDecision?: "forbid" | "allow_once" | "allow_always";
   };
 
   try {
+    if (body.conflictDecision && body.projectId) {
+      await applyProjectConflictDecision({
+        deviceId,
+        projectId: body.projectId,
+        folderKey: body.folderKey,
+        decision: body.conflictDecision,
+      });
+    }
     const device = await updateDevice(deviceId, body);
     return NextResponse.json({ ok: true, device });
   } catch (error) {