Add optional room areas

src/shared/validation/project-structure.schemas.ts

@@ -135,6 +135,7 @@ export const createRoomSchema = z
     floorId: z.string().trim().min(1).optional(),
     roomNumber: z.string().trim().min(1).max(50),
     roomName: z.string().trim().min(1).max(200),
+    areaM2: z.number().finite().nonnegative().nullable().optional(),
   })
   .strict();
 
@@ -144,6 +145,7 @@ export const updateRoomSchema = z
     floorId: z.string().trim().min(1).nullable(),
     roomNumber: z.string().trim().min(1).max(50),
     roomName: z.string().trim().min(1).max(200),
+    areaM2: z.number().finite().nonnegative().nullable().optional(),
   })
   .strict();