govin 098bfd1bfb frontend: add the template configuration UI
The shell: the app mark at both ends of the header, the two top-level
entries between them, and the second-level menu on the right. That menu is
driven entirely by `route.meta.section`, so a route declares which menu it
belongs to and a deep link renders the right one on first paint; routes with
no section (the welcome page) show none.

Screens:
  /                    welcome, with live template and field counts so the
                       page doubles as a connectivity check
  /papers              论文, content still to be decided
  /templates/list      the template table: search, create, edit, preview,
                       delete, batch delete, pagination
  /templates/fields    the field library: the same CRUD, plus level filter

The template form is the centre of it. Fields are chosen from the flat
library by clicking — any subset, any order, the same field more than once —
and the selection is always rendered sorted by `sort`, so editing a number
reorders the outline immediately. Repeats and duplicate sorts are surfaced as
warnings rather than blocked, because a repeat is often deliberate and a tie
is legal; a "自动排序" button renumbers the selection 1..N. The panel on the
right of the picker opens 字段管理 in a second tab, so a half-filled form is
never lost to a navigation.

The preview drawer renders the outline exactly as it will read, at each
field's own size and colour, with the sort value shown alongside — the
quickest way to confirm the ordering before writing against a template.

Also in this change:

  - ApiError now extends Error. It was a plain object, so the common
    `error instanceof Error ? error.message : ...` idiom fell through to a
    generic message and threw away what the server actually said — such as
    which template name is already taken. Server messages now reach the user.
  - font colours are normalised client-side on blur, matching the backend,
    so a hand-typed rgb(255, 0, 0) is tidied up rather than rejected later.
  - api/health.ts is removed: the rewritten welcome page was its only
    consumer, and the counts already prove connectivity.
2026-09-18 16:00:02 +08:00
2026-09-15 03:04:50 +08:00
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