chore(desktop): move inline bilingual copy into catalogs

[orangeCatDeveloper]

Summary

Mechanical consolidation wave from the repo-wide locale sweep — one transform across 28 files, no behavior changes, every zh and en string byte-identical (verified by literal-multiset comparison): inline locale === 'zh' ? … : … and locale.startsWith('zh') copy selection moves into typed satisfies UiCatalog<T> catalogs.

New catalogs: peer-mesh-copy.ts (~150 keys out of the 2137-line dialog), agent-graph-copy.ts, task-readiness-copy.ts (retargeted to features/conversation after main's refactor). Routed into existing catalogs: the transport-label ternaries in runtime-host-profiles-section.tsx, notifications-policy.ts (colocated main-process catalog), mcp-catalog.ts (en overlay restructured as UiCatalog, exported API unchanged). packages/core/redaction.ts gains a thin generalizedErrorMessageForLocale dispatcher and every scattered locale === 'zh' ? generalizedErrorMessageChinese(…) : generalizedErrorMessage(…) pair (19 sites across desktop and packages/ui) now calls it. One deliberate exception kept with a site comment: provider-add-form.tsx zh passthrough of raw validation detail.

Follow-up in 2858de475: the first pass added a routeState.unknown entry (路径未知 / Route unknown) that no locale could render — PeerMeshMemberProjection.state is a closed five-value union — so it is removed and the byte-identical claim above holds as stated.

Refs #2672

Verification

apps/desktop typecheck (4 tsconfigs):   0 errors
renderer architecture check:            passed against merge-base
touched-module tests:                   53 pass / 0 fail
repo format:check:                      no issues

String fidelity verified by literal-multiset comparison across the whole file set (every zh/en string preserved verbatim); independent subagent review found no issues. Rebase note: main's new peer route-state vocabulary (connecting/reachable/reconnecting/needs_repair) is synced into peer-mesh-copy.ts verbatim.

AI use

Select exactly one:

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: Claude Code — migration implementation and this description, under the contributor's direction. Each commit carries a Generated-by: Claude Code trailer.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

No new tests: this is a mechanical copy relocation with no new behavior to exercise. String fidelity is verified by literal-multiset comparison rather than by a suite, and the existing tests over the touched modules (53 pass) keep covering their behavior.

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No