fix(confgen): dedup refer load errors and locate them to referred target

[Kybxd]

Problem

When a refer target (e.g. AssistSkillConf.ID) fails to load its value space -- for instance because the referred sheet has a broken row that makes RangeDataRows return an error via Ignored() / parseColumns / etc. -- every row on the referring side would re-invoke loadFunc and re-emit the same error, producing N duplicate errors for one root cause.

Additionally, those N errors were wrapped with the source sheet's BookName / SheetName (the sheet under generation), which pointed users away from the sheet actually containing the offending row.

Changes

ReferredCache: negative caching

• New failed map[string]struct{} tracks refer expressions whose load has already failed.
• On loadFunc(refer) error, the failure is still surfaced to the caller (the collector receives the real error once), and the refer is marked as failed.
• Subsequent ExistsValue calls for the same refer short-circuit to (true, nil) instead of re-triggering the load. This preserves error visibility while eliminating the N-way duplication.
• Double-checked locking treats failed the same way as references, so concurrent callers don't race into duplicate loads.

AddFromTable: locate errors on the referred target

• Wraps RangeDataRows errors with KeyReferBookName / KeyReferSheetName.
• Outer confgen wrappers still set BookName / SheetName to the source sheet under generation (which is what users need to find the refer expression in the schema), while the new keys pinpoint the referred workbook / worksheet that actually contains the offending row.

Supporting bits

• xerrors/desc.go: add KeyReferBookName / KeyReferSheetName constants and register them in keys.
• i18n templates (zh.yaml / en.yaml): render ReferWorkbook / ReferWorksheet (引用工作簿 / 引用工作表) when present.

Behavior after this PR

Given AffixConf referring AssistSkillConf.ID and AssistSkill.xlsx having a broken row (e.g. an #IGNORE cell that fails to parse as bool):

Error source	Before	After
AssistSkill.xlsx self-generation error	1	1
AffixConf first refer check that triggers the load	1	1
Every subsequent row referring the same target	N	0
Wrapped BookName / SheetName in the refer-side error	source sheet only	source sheet + ReferBookName / ReferSheetName pointing at AssistSkill.xlsx

Verification

• go build ./...
• go test ./internal/confgen/... ./internal/confgen/fieldprop/...

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf CI / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Aug 17, 2026, 7:12 AM

[codecov]

Codecov Report

❌ Patch coverage is 95.31250% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.79%. Comparing base (108a85f) to head (63545b0).

Files with missing lines	Patch %	Lines
internal/confgen/fieldprop/refer.go	95.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #446      +/-   ##
==========================================
+ Coverage   75.58%   75.79%   +0.21%     
==========================================
  Files          88       88              
  Lines        9593     9615      +22     
==========================================
+ Hits         7251     7288      +37     
+ Misses       1760     1748      -12     
+ Partials      582      579       -3     

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