feat: add pause/resume functionality for API keys (#158)

- Add isActive field to API key schema with migration
- Implement PUT /api/keys/[id] endpoint for toggle
- Update validation to reject paused keys (403)
- Add UI toggle controls with confirmation
- Ensure cloud sync preserves pause state

src/app/api/keys/[id]/route.js

@@ -1,8 +1,48 @@
 import { NextResponse } from "next/server";
-import { deleteApiKey, isCloudEnabled } from "@/lib/localDb";
+import { deleteApiKey, getApiKeyById, updateApiKey, isCloudEnabled } from "@/lib/localDb";
 import { getConsistentMachineId } from "@/shared/utils/machineId";
 import { syncToCloud } from "@/app/api/sync/cloud/route";
 
+// GET /api/keys/[id] - Get single key
+export async function GET(request, { params }) {
+  try {
+    const { id } = await params;
+    const key = await getApiKeyById(id);
+    if (!key) {
+      return NextResponse.json({ error: "Key not found" }, { status: 404 });
+    }
+    return NextResponse.json({ key });
+  } catch (error) {
+    console.log("Error fetching key:", error);
+    return NextResponse.json({ error: "Failed to fetch key" }, { status: 500 });
+  }
+}
+
+// PUT /api/keys/[id] - Update key
+export async function PUT(request, { params }) {
+  try {
+    const { id } = await params;
+    const body = await request.json();
+    const { isActive } = body;
+
+    const existing = await getApiKeyById(id);
+    if (!existing) {
+      return NextResponse.json({ error: "Key not found" }, { status: 404 });
+    }
+
+    const updateData = {};
+    if (isActive !== undefined) updateData.isActive = isActive;
+
+    const updated = await updateApiKey(id, updateData);
+    await syncKeysToCloudIfEnabled();
+
+    return NextResponse.json({ key: updated });
+  } catch (error) {
+    console.log("Error updating key:", error);
+    return NextResponse.json({ error: "Failed to update key" }, { status: 500 });
+  }
+}
+
 // DELETE /api/keys/[id] - Delete API key
 export async function DELETE(request, { params }) {
   try {