Add detailed room create debug steps and exception header

src/main/kotlin/com/android/trisolarisserver/controller/Rooms.kt

@@ -189,13 +189,23 @@ class Rooms(
             response.setHeader("X-Room-Create-Step", "member_ok")
         }
 
+        try {
+            if (debugAuth == "1") {
+                response.setHeader("X-Room-Create-Step", "check_duplicate")
+            }
             if (roomRepo.existsByPropertyIdAndRoomNumber(propertyId, request.roomNumber)) {
                 throw ResponseStatusException(HttpStatus.CONFLICT, "Room number already exists for property")
             }
 
+            if (debugAuth == "1") {
+                response.setHeader("X-Room-Create-Step", "load_property")
+            }
             val property = propertyRepo.findById(propertyId).orElseThrow {
                 ResponseStatusException(HttpStatus.NOT_FOUND, "Property not found")
             }
+            if (debugAuth == "1") {
+                response.setHeader("X-Room-Create-Step", "resolve_room_type")
+            }
             val roomType = resolveRoomType(propertyId, request)
 
             val room = Room(
@@ -209,12 +219,22 @@ class Rooms(
                 notes = request.notes
             )
 
+            if (debugAuth == "1") {
+                response.setHeader("X-Room-Create-Step", "save_room")
+            }
             val saved = roomRepo.save(room).toRoomResponse()
             if (debugAuth == "1") {
                 response.setHeader("X-Room-Create-Step", "saved")
             }
             roomBoardEvents.emit(propertyId)
             return saved
+        } catch (ex: Exception) {
+            if (debugAuth == "1") {
+                val msg = ex.message?.take(200) ?: ""
+                response.setHeader("X-Room-Create-Exception", "${ex::class.java.simpleName}:$msg")
+            }
+            throw ex
+        }
     }
 
     @PutMapping("/{roomId}")