参考模型 create_version 不再要求幂等 key

自然幂等键只由 `(game_id, version_number)` 派生，只校验摘要非空；与生产统一发布「版本号即身份」口径一致，去掉无意义的 Idempotency-Key 必填

server-rs/crates/module-game-distribution/src/application.rs

@@ -145,17 +145,21 @@ impl GameDistributionService {
         let package_sha256 = normalize_package_digest(&input.package_sha256)?;
         validate_package_bytes(input.package_bytes)?;
         let price_mud_points = normalize_game_price_mud_points(input.price_mud_points)?;
-        let idem = normalize_idempotency(input.idempotency)?;
+        // 新版本的自然幂等键只有 `(game_id, version_number)`：调用方不再需要传 key，这里从版本号
+        // 派生；只要求摘要非空。`IdempotencyRequest.key` 对这条命令不再有意义。
+        let request_digest = normalize_id(input.idempotency.request_digest).ok_or(
+            GameDistributionError::Field(GameDistributionFieldError::MissingRequestDigest),
+        )?;
         let scope = scope(
             &owner_user_id,
             GameDistributionAction::CreateVersion,
             &IdempotencyRequest {
                 key: game_distribution_version_key(&game_id, None, input.version_number),
-                request_digest: idem.request_digest.clone(),
+                request_digest: request_digest.clone(),
             },
         );
         let mut state = lock(&self.store)?;
-        if let Some(outcome) = replay_outcome(&state, &scope, &idem.request_digest)? {
+        if let Some(outcome) = replay_outcome(&state, &scope, &request_digest)? {
             return version_result(outcome, true);
         }
         let game = state
@@ -186,7 +190,7 @@ impl GameDistributionService {
         remember(
             &mut state,
             scope,
-            idem.request_digest,
+            request_digest,
             StoredOutcome::Version(snapshot.clone()),
         );
         Ok(GameOperationResult {