fix: change work_item_batch_size type from usize to u64 in CLI and config

Author: sergeytimoshin

forester/src/cli.rs

@@ -306,10 +306,10 @@ pub struct StartArgs {
     #[arg(
         long,
         env = "WORK_ITEM_BATCH_SIZE",
-        value_parser = clap::value_parser!(usize).range(1..),
+        value_parser = clap::value_parser!(u64).range(1..),
         help = "Number of queue items to process per batch cycle. Smaller values reduce blockhash expiry risk, larger values reduce per-batch overhead."
     )]
-    pub work_item_batch_size: Option<usize>,
+    pub work_item_batch_size: Option<u64>,
 
     #[arg(
         long,

forester/src/config.rs

@@ -431,7 +431,7 @@ impl ForesterConfig {
                 .transpose()?,
             min_queue_items: args.min_queue_items,
             enable_v1_multi_nullify: args.enable_v1_multi_nullify,
-            work_item_batch_size: args.work_item_batch_size.unwrap_or(50).max(1),
+            work_item_batch_size: args.work_item_batch_size.unwrap_or(50) as usize,
         })
     }