删除客户端每回合四项媒体资源请求上限 (#427)

- direct_tool_bridge.rs 删除 DIRECT_TOOL_BRIDGE_MAX_RESOURCE_CALLS_PER_TURN 常量、回合授权状态的 resource_request_ids 计数 map 与 resource_request_ids() 方法
- agc_create_or_derive_resource（含 agc_edit_image 委托）与 agc_remove_background 统一按回合身份与请求指纹确定性派生 operation/idempotency id，同指纹重试复用与 pending 对账语义不变
- 付费提交串行仍由 resource_generation_gate 互斥保证，成本控制交由服务端计费与泥点余额兜底
- 决策记录新增 2026-09-19 删除上限条目，2026-09-18 抠图豁免条目标记为仅作追溯
- 实施计划文档同步改为「不同请求串行提交，不设每回合计数上限」

Reviewed-on: #427
Co-authored-by: Linghong <ink29535@proton.me>
Co-committed-by: Linghong <ink29535@proton.me>

apps/ai-game-creator-shell/src-tauri/src/agent/direct_tool_bridge.rs

@@ -27,7 +27,6 @@ const DIRECT_TOOL_BRIDGE_SEARCH_URL: &str = "https://www.bing.com/search?format=
 const DIRECT_TOOL_BRIDGE_MAX_RESOURCE_NAME_CHARS: usize = 120;
 const DIRECT_TOOL_BRIDGE_MAX_RESOURCE_KIND_CHARS: usize = 80;
 const DIRECT_TOOL_BRIDGE_MAX_RESOURCE_PAGE_SIZE: usize = 100;
-const DIRECT_TOOL_BRIDGE_MAX_RESOURCE_CALLS_PER_TURN: usize = 4;
 const DIRECT_TOOL_BRIDGE_MAX_ACCOUNT_ASSET_ID_CHARS: usize = 512;
 const DIRECT_TOOL_BRIDGE_MAX_LOCAL_ASSET_PATH_CHARS: usize = 512;
 
@@ -68,7 +67,6 @@ struct DirectToolBridgeActiveTurnAuthorization {
     turn_id: String,
     brief_sha256: Option<String>,
     completed_result: Option<Value>,
-    resource_request_ids: BTreeMap<String, (String, String)>,
 }
 
 enum DirectToolBridgeRegenerationCall {
@@ -207,7 +205,6 @@ impl DirectToolBridgeState {
             turn_id: turn_id.clone(),
             brief_sha256: None,
             completed_result: None,
-            resource_request_ids: BTreeMap::new(),
         });
         Ok(DirectToolBridgeTurnGuard {
             state: Arc::clone(self),
@@ -637,33 +634,7 @@ impl DirectToolBridgeState {
         Ok(())
     }
 
-    fn resource_request_ids(&self, request_fingerprint: &str) -> Result<(String, String), String> {
-        let mut authorization = self
-            .turn_authorization
-            .lock()
-            .map_err(|_| "AGC 工具桥回合授权状态不可用".to_string())?;
-        let active = authorization
-            .active
-            .as_mut()
-            .ok_or_else(|| "当前没有客户端签发的资源生成回合身份".to_string())?;
-        if let Some(ids) = active.resource_request_ids.get(request_fingerprint) {
-            return Ok(ids.clone());
-        }
-        if active.resource_request_ids.len() >= DIRECT_TOOL_BRIDGE_MAX_RESOURCE_CALLS_PER_TURN {
-            return Err("单个用户回合最多只能创建四项媒体资源请求".to_string());
-        }
-        let operation_id =
-            direct_resource_request_uuid(&active.turn_id, "operation", request_fingerprint);
-        let idempotency_key =
-            direct_resource_request_uuid(&active.turn_id, "idempotency", request_fingerprint);
-        active.resource_request_ids.insert(
-            request_fingerprint.to_string(),
-            (operation_id.clone(), idempotency_key.clone()),
-        );
-        Ok((operation_id, idempotency_key))
-    }
-
-    /// 不计费的派生请求（如抠图）不进 `resource_request_ids` 计数，只取回合身份做确定性 id 派生。
+    /// 取当前回合身份，媒体资源请求按回合身份与请求指纹确定性派生 operation/idempotency id。
     fn active_resource_turn_id(&self) -> Result<String, String> {
         let authorization = self
             .turn_authorization
@@ -1903,8 +1874,11 @@ async fn bridge_create_or_derive_resource(
             ))
             .await?
         } else {
-            let (operation_id, idempotency_key) =
-                state.resource_request_ids(&request_fingerprint)?;
+            let turn_id = state.active_resource_turn_id()?;
+            let operation_id =
+                direct_resource_request_uuid(&turn_id, "operation", &request_fingerprint);
+            let idempotency_key =
+                direct_resource_request_uuid(&turn_id, "idempotency", &request_fingerprint);
             let revision = read_game_creator_agent_runtime_project_revision(&state.root)?.revision;
             let source_resource_id = source_asset
                 .as_ref()
@@ -2014,8 +1988,7 @@ async fn bridge_remove_background(state: &DirectToolBridgeState, arguments: &Val
             })
             .await?
         } else {
-            // 抠图不计费且服务端秒级完成，不占每回合付费媒体请求的四项额度，不进计数 map；
-            // id 仍按回合身份与请求指纹确定性派生，同指纹重试与 pending 对账语义不变。
+            // id 按回合身份与请求指纹确定性派生，同指纹重试与 pending 对账语义不变。
             let turn_id = state.active_resource_turn_id()?;
             let operation_id = direct_resource_request_uuid(&turn_id, "operation", &fingerprint);
             let idempotency_key =