feat(ui): Display machine_id in host details page and enable search

- Added machine_id field to host details page
- Backend now returns machine_id in all host queries
- Users can search hosts by machine_id
- Added hostname index to schema for better performance

backend/src/routes/dashboardRoutes.js

@@ -185,6 +185,7 @@ router.get("/hosts", authenticateToken, requireViewHosts, async (_req, res) => {
 			// Show all hosts regardless of status
 			select: {
 				id: true,
+				machine_id: true,
 				friendly_name: true,
 				hostname: true,
 				ip: true,

backend/src/routes/searchRoutes.js

@@ -70,10 +70,12 @@ router.get("/", authenticateToken, async (req, res) => {
 							{ hostname: { contains: searchTerm, mode: "insensitive" } },
 							{ friendly_name: { contains: searchTerm, mode: "insensitive" } },
 							{ ip: { contains: searchTerm, mode: "insensitive" } },
+							{ machine_id: { contains: searchTerm, mode: "insensitive" } },
 						],
 					},
 					select: {
 						id: true,
+						machine_id: true,
 						hostname: true,
 						friendly_name: true,
 						ip: true,