feat: 搜索页支持JSON扫码直达，去掉前缀提示

- 搜索输入框内容若是JSON则解码，type为ops_sys时根据module跳转（workorder→工单详情，item→物品详情）
- JSON解码后无论type是否为ops_sys都清空输入框
- 非JSON内容走原有关键字搜索逻辑
- 去掉前缀快捷搜索提示文本

app/src/main/java/com/example/ops_android/ui/navigation/OPSNavGraph.kt

@@ -111,7 +111,13 @@ fun OPSNavGraph(isLoggedIn: Boolean) {
                 onWorkOrderClick = { id -> rootNavController.navigate(Routes.workOrderDetail(id)) },
                 onItemClick = { id -> rootNavController.navigate(Routes.itemDetail(id)) },
                 onContainerClick = { id -> rootNavController.navigate(Routes.MAIN) },
-                onBack = { rootNavController.popBackStack() }
+                onBack = { rootNavController.popBackStack() },
+                onOpsSysNavigate = { module, id ->
+                    when (module) {
+                        "workorder" -> rootNavController.navigate(Routes.workOrderDetail(id))
+                        "item" -> rootNavController.navigate(Routes.itemDetail(id))
+                    }
+                }
             )
         }
         composable(Routes.SCHEDULE) {

app/src/main/java/com/example/ops_android/ui/search/SearchScreen.kt

@@ -28,7 +28,7 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalLifecycleOwner
 import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.text.style.TextAlign
+
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.viewinterop.AndroidView
@@ -51,7 +51,8 @@ fun SearchScreen(
     onWorkOrderClick: (Int) -> Unit,
     onItemClick: (Int) -> Unit,
     onContainerClick: (Int) -> Unit,
-    onBack: () -> Unit
+    onBack: () -> Unit,
+    onOpsSysNavigate: (module: String, id: Int) -> Unit
 ) {
     val appContainer = LocalAppContainer.current
     val viewModel: SearchViewModel = viewModel(
@@ -67,6 +68,13 @@ fun SearchScreen(
         if (granted) showScanner = true
     }
 
+    LaunchedEffect(uiState.opsSysNavigation) {
+        uiState.opsSysNavigation?.let { navInfo ->
+            onOpsSysNavigate(navInfo.module, navInfo.id)
+            viewModel.clearOpsSysNavigation()
+        }
+    }
+
     fun checkCameraAndScan() {
         if (ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
             hasCameraPermission = true
@@ -128,14 +136,6 @@ fun SearchScreen(
                 }
             }
 
-            // Prefix hints
-            Text(
-                "前缀快捷搜索: po:采购单 wo:工单 item:物品 warehouse:容器",
-                fontSize = 11.sp,
-                color = Color.Gray,
-                modifier = Modifier.padding(horizontal = 16.dp),
-                textAlign = TextAlign.Center
-            )
 
             // Category tabs
             PrimaryScrollableTabRow(

app/src/main/java/com/example/ops_android/ui/search/SearchViewModel.kt

@@ -7,7 +7,6 @@ import com.example.ops_android.data.model.Container
 import com.example.ops_android.data.model.Item
 import com.example.ops_android.data.model.PurchaseOrder
 import com.example.ops_android.data.model.WorkOrder
-import com.example.ops_android.data.repository.CustomerRepository
 import com.example.ops_android.data.repository.OrderRepository
 import com.example.ops_android.data.repository.WarehouseRepository
 import com.example.ops_android.data.repository.WorkOrderRepository
@@ -15,6 +14,7 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
+import org.json.JSONObject
 
 enum class SearchCategory(val label: String) {
     ALL("全部"),
@@ -24,6 +24,11 @@ enum class SearchCategory(val label: String) {
     CONTAINER("容器")
 }
 
+data class OpsSysNavInfo(
+    val module: String,
+    val id: Int
+)
+
 data class SearchUiState(
     val query: String = "",
     val category: SearchCategory = SearchCategory.ALL,
@@ -32,7 +37,8 @@ data class SearchUiState(
     val items: List<Item> = emptyList(),
     val containers: List<Container> = emptyList(),
     val isSearching: Boolean = false,
-    val errorMessage: String? = null
+    val errorMessage: String? = null,
+    val opsSysNavigation: OpsSysNavInfo? = null
 )
 
 class SearchViewModel(
@@ -61,7 +67,19 @@ class SearchViewModel(
         val query = _uiState.value.query.trim()
         if (query.isEmpty()) return
 
-        // Parse prefix shortcuts
+        val jsonObj = try { JSONObject(query) } catch (e: Exception) { null }
+        if (jsonObj != null) {
+            _uiState.value = _uiState.value.copy(query = "")
+            if (jsonObj.optString("type") == "ops_sys") {
+                val module = jsonObj.optString("module")
+                val id = jsonObj.optInt("id")
+                if (module.isNotBlank() && id > 0) {
+                    _uiState.value = _uiState.value.copy(opsSysNavigation = OpsSysNavInfo(module, id))
+                }
+            }
+            return
+        }
+
         val (actualCategory, actualQuery) = parsePrefix(query)
         _uiState.value = _uiState.value.copy(category = actualCategory)
 
@@ -125,6 +143,10 @@ class SearchViewModel(
         _uiState.value = SearchUiState(query = _uiState.value.query, category = _uiState.value.category)
     }
 
+    fun clearOpsSysNavigation() {
+        _uiState.value = _uiState.value.copy(opsSysNavigation = null)
+    }
+
     private fun parsePrefix(query: String): Pair<SearchCategory, String> {
         val prefixes = mapOf(
             "po:" to SearchCategory.ORDER,