A reader has a card and an origin has a label

[WaylandYang]

This is the interface cut for decision record 0040. The Models page gets cards for the two readers added in #720 and #721, and evidence and document sections now say when their words were read by a model rather than written in the file.

What changes

• Administration → Models: a new "Reading scans and recordings" section below the chat and embedding cards, with two cards.
  • Document reading (OCR): service URL, backend (optional), API key. Saves to PUT …/settings/ocr.
  • Transcription: base URL, model, API key. Saves to PUT …/settings/transcribe.
  • Both follow the existing card rules (Models settings: unclear save and connection-test feedback #698):
    • an edit makes the card dirty and disables Test;
    • "Testing…" only lights on the card that was pressed;
    • a fresh result replaces the saved state;
    • the key field says when a key is configured.
  • After a save that re-queued waiting files, the card says so, e.g. "Saved. 1 waiting file is being read."
  • Test results: OCR shows "Reachable (MinerU 2.5.4)", transcription shows "Reachable and authenticated", and errors appear in the danger tone.
• Origin labels (web/src/origin.ts, with vitest):
  • Words the file itself holds carry no label.
  • The other origins read OCR · p. 2, Transcribed · 1:04–1:37 · A, B and Described by a model.
  • Hovering a label says what to watch for (a misread digit, a misheard name, nobody said this) and which model read it.
  • Where labels appear:
    • the fact evidence card on the graph page, next to the file and section link;
    • each section header in the document viewer.
• Alert copy: document.needs_reader no longer says "neither is configured" (one reader may be), and points to Administration → Models.
• API types: settings view, test results, the two save calls, and origin fields on Evidence. ChunkFull already had them.
• en and zh strings are included.

Verification

• pnpm build passes (style guard, tsc, vite) and pnpm test passes 63 tests, 6 of them new.
• Looked at in a browser against a real server: this branch's web/dist, cut 3's binary, a copied database, and fake MinerU and transcription services.
  • Models page: the two new cards sit under their own heading and match the existing cards.
    • Filling the OCR URL showed "Unsaved changes…" with Test disabled.
    • Save showed "Saved. 1 waiting file is being read.", and the scan uploaded before the service existed was then read.
    • Test showed "Reachable (MinerU 2.5.4)".
  • Document viewer for that scan: "Section 1 · OCR · p. 1" and "Section 2 · OCR · p. 2", with the rent table as a Markdown table.
  • Graph → entity → evidence: chunks marked in the copied database show "OCR · p. 2" and "Transcribed · 1:04–1:37 · A, B" next to the source link.

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