fix(frontend): remove stale truth surfaces and harden i18n

[DeliciousBuding]

Summary

• remove the message-card copy-link affordance whose generated hash routes had no consumer
• localize preview and Hub-mapping fallback UI without exposing raw parser/HTTP details
• harden the CJK i18n ratchet from advisory aggregate counts to a hard per-file budget
• persist only irreducible i18n debt (path -> budget); samples/totals are recomputed instead of stored
• trim stale query-key / mapping history now owned by ADRs and current contracts
• keep Web projection tests locale-agnostic

Net repository change versus master: 460 additions / 1162 deletions (net -702).

This is intentionally a subtraction pass: no replacement abstraction was added for the removed preview error protocol, and the verifier stores less derived state while retaining per-file fail-closed protection.

Verification

• Shared targeted: 37/37
• Workbench targeted: 111/111
• Web App: 12/12
• Shared / Workbench / Web typecheck: PASS
• i18n callsite ratchet + 5 negative/positive self-tests: PASS
• i18n terminology + dead-key gates: PASS
• doc SSOT + CI gate policy + CI mutation tests: PASS
• frontend package boundary + quality-debt ratchet: PASS
• secret guard + git diff --check: PASS
• GitHub required CI: all green, including PostgreSQL+Redis integration, Windows frontend, Visual QA, stubbed-Hub E2E and coverage baselines

Refs #2274

Negative constraints

• does not close umbrella 前端探索批收口：原始 37 条已处置，现役代码与回归已复核 #2274
• does not change DataMode architecture; that complexity root is a separate follow-up
• does not weaken a gate or add a broad exemption

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