收口微信领域能力

将 api-server 微信 HTTP/BFF 适配统一迁移到 wechat 目录。

将微信支付和虚拟支付消息协议细节下沉到 platform-wechat。

拆分 platform-wechat 的订阅消息与支付模块并补齐依赖。

修正微信相关测试的用户 ID 夹具并同步后端架构文档。

server-rs/crates/api-server/src/square_hole.rs

@@ -81,7 +81,7 @@ use crate::{
         SquareHoleAgentTurnRequest, build_finalize_record_input, run_square_hole_agent_turn,
     },
     state::AppState,
-    wechat_subscribe_message::{
+    wechat::subscribe_message::{
         GenerationResultSubscribeMessage, GenerationResultSubscribeMessageStatus,
         send_generation_result_subscribe_message_after_completion,
     },
@@ -1119,12 +1119,15 @@ async fn compile_square_hole_draft_for_session(
         .map(|tags| serde_json::to_string(&normalize_tags(tags.clone())).unwrap_or_default());
 
     let resolved_game_name = game_name.or_else(|| Some(format!("{}方洞挑战", config.theme_text)));
-    let generation_points_cost = crate::creation_entry_config::resolve_creation_entry_mud_point_cost(
-        state,
-        SQUARE_HOLE_TEMPLATE_ID,
-        u64::from(shared_contracts::creation_entry_config::DEFAULT_UNIFIED_CREATION_MUD_POINT_COST),
-    )
-    .await;
+    let generation_points_cost =
+        crate::creation_entry_config::resolve_creation_entry_mud_point_cost(
+            state,
+            SQUARE_HOLE_TEMPLATE_ID,
+            u64::from(
+                shared_contracts::creation_entry_config::DEFAULT_UNIFIED_CREATION_MUD_POINT_COST,
+            ),
+        )
+        .await;
     let result = state
         .spacetime_client()
         .compile_square_hole_draft(SquareHoleCompileDraftRecordInput {