修复资产计费边界风险

资产生成预扣费改为 fail-closed，避免钱包异常时继续调用外部生成

新增钱包退款 outbox，退款失败时本地落盘并后台重放

拼图首图后台任务改用 SpacetimeDB claim 表实现跨实例互斥

计费 ledger id 统一绑定 request_id，并让前端重试复用 x-request-id

同步 SpacetimeDB bindings、后端架构文档和 Hermes 决策记录

server-rs/crates/spacetime-client/src/mapper.rs

@@ -101,7 +101,8 @@ pub use self::puzzle::{
     PuzzleAgentMessageFinalizeRecordInput, PuzzleAgentMessageRecord,
     PuzzleAgentMessageSubmitRecordInput, PuzzleAgentSessionCreateRecordInput,
     PuzzleAgentSessionRecord, PuzzleAgentSuggestedActionRecord, PuzzleAnchorItemRecord,
-    PuzzleAnchorPackRecord, PuzzleAudioAssetRecord, PuzzleBoardRecord, PuzzleCellPositionRecord,
+    PuzzleAnchorPackRecord, PuzzleAudioAssetRecord, PuzzleBackgroundCompileTaskClaimRecordInput,
+    PuzzleBackgroundCompileTaskReleaseRecordInput, PuzzleBoardRecord, PuzzleCellPositionRecord,
     PuzzleCreatorIntentRecord, PuzzleDraftCompileFailureRecordInput, PuzzleDraftLevelRecord,
     PuzzleFormDraftRecord, PuzzleFormDraftSaveRecordInput, PuzzleGalleryCardRecord,
     PuzzleGeneratedImageCandidateRecord, PuzzleGeneratedImagesSaveRecordInput,
@@ -199,10 +200,10 @@ pub(crate) use self::public_work::{
     map_public_work_gallery_entry, map_public_work_gallery_entry_to_detail_entry,
 };
 pub(crate) use self::puzzle::{
-    map_puzzle_agent_session_procedure_result, map_puzzle_gallery_card_view_row,
-    map_puzzle_run_procedure_result, map_puzzle_work_procedure_result,
-    map_puzzle_works_procedure_result, map_runtime_profile_wallet_ledger_source_type_back,
-    parse_puzzle_agent_stage_record,
+    map_puzzle_agent_session_procedure_result, map_puzzle_background_compile_task_procedure_result,
+    map_puzzle_gallery_card_view_row, map_puzzle_run_procedure_result,
+    map_puzzle_work_procedure_result, map_puzzle_works_procedure_result,
+    map_runtime_profile_wallet_ledger_source_type_back, parse_puzzle_agent_stage_record,
 };
 pub(crate) use self::puzzle_clear::{
     map_puzzle_clear_agent_session_procedure_result, map_puzzle_clear_gallery_card_view_row,