feat(recipes): delegate CivitAI-image re-import to companion browser extension

Recipes imported from CivitAI image URLs can contain 0 LoRAs: the backend
only sees the REST image API + EXIF, while the complete generation data
lives in the image page's internal trpc payload (see
docs/recipe-civitai-image-no-metadata.md). When the companion
lm-civitai-extension is installed with a valid license, re-import (single
and bulk) of CivitAI-image-sourced recipes is now delegated to the
extension via DOM CustomEvents; the extension scrapes the image page with
the user's session and calls back into the reimport endpoint with the
full metadata payload. Without the extension (or with an invalid license)
the native path runs unchanged.

- POST /api/lm/recipe/{id}/reimport accepts optional payload params
  (image_url/name/resources/gen_params/base_model/tags); the payload path
  reuses the import-remote engine with reimport semantics (user-edit
  carryover, delete-after-save), and malformed/failed payloads fall back
  to the legacy URL import. Response gains loras_count.
- The endpoint also accepts GET: the extension is GET-only by convention
  (documented in AGENTS.md).
- New static/js/utils/extensionReimportBridge.js (probeExtension /
  delegateReimport / getCivitaiImageInfo) wired into RecipeContextMenu
  and BulkManager with silent native fallback.
- i18n: toast.recipes.reimportingViaExtension added and translated in
  all 9 locales.

locales/zh-TW.json

@@ -2229,6 +2229,7 @@
             "rematchSkipped": "{total} 個所選配方均無需重新匹配",
             "rematchFailed": "重新匹配所選配方失敗：{message}",
             "reimporting": "正在從來源重新匯入配方...",
+            "reimportingViaExtension": "正在透過瀏覽器擴充功能重新匯入配方 {current}/{total}...",
             "reimportSuccess": "配方已從來源重新匯入成功",
             "reimportBulkComplete": "重新匯入完成：{completed} 個已匯入，{failed} 個失敗（共 {total} 個）",
             "reimportBulkFailed": "重新匯入某些配方失敗",