feat(gitea): 新增 HTML 匯出與範本風格設定

What：新增 html-export 與 html-style 兩支技能、tools/html-render.sh 與 tools/html-style.sh 兩支工具，以及六種版型乘五種風格的 HTML 範本。

Why：wiki 頁與議題要拿給 Gitea 以外的人看時，只能複製 markdown；不同類型的文件也該有各自的版面，不是每份都長一樣。

How：版型（report、slide、dashboard、spec、timeline、onepager）決定內容怎麼排，風格（minimal、corporate、dark、print、vivid）決定看起來長怎樣，兩者自由搭配。哪一種頁面套哪一組由設定決定：專案的 .jsc/html-styles 優先，其次 $JSC_HOME/html-styles.conf，對不到退 DEFAULT，再對不到才用內建的 report／minimal。產出是單一 HTML 檔，CSS 與腳本全部內嵌。

Who：需要把 wiki 頁或議題寄給客戶、主管或跨團隊同事的人。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

skills/html-export/SKILL.md

@@ -0,0 +1,28 @@
+---
+name: html-export
+description: Export one Gitea wiki page or issue as a single self-contained HTML file. Parse the link with tools/gitea-link.sh, resolve that kind's layout and style through tools/html-style.sh (kind, then DEFAULT, then the built-in report/minimal), then render with tools/html-render.sh, which puts the markdown through Gitea's own renderer and inlines every asset. A request without a wiki or issue link stops the skill immediately: never guess the repository, the page or the issue number. Use when a page or issue has to leave Gitea as a document; not for choosing which template a kind uses - that is jsc-gitea:html-style.
+---
+
+# html-export — a wiki page or issue becomes one HTML file
+
+The link is the only input. The output is one file that opens anywhere, with no external asset.
+
+## Steps
+
+1. **Link gate.** Run `tools/gitea-link.sh parse {url}`. Exit 3 or no link in the request: **stop and report it**. Never fall back to the working directory's remote or to a page name the user mentioned in passing. Completion condition: `kind` is `wiki` or `issue`, and `repo` plus `page` or `index` are known.
+2. **Work out the kind key** — it decides which template applies:
+   - wiki page → `WIKI:{prefix}`, where the prefix is the page name up to the first underscore (`ANALYZE_D3F1A2B0` → `WIKI:ANALYZE`; a page with no underscore uses the whole name).
+   - issue → run `tools/issue.sh labels-of {repo} {index}` and try `ISSUE:{label}` for each label in order; the first one `tools/html-style.sh get` answers with source `project` or `global` wins. No label matches: use `ISSUE:DEFAULT`.
+
+   Completion condition: exactly one kind key is chosen, and you can say which label or prefix produced it.
+3. Run `tools/html-style.sh get {key}`. It always prints `layout<TAB>style<TAB>source`. **Read the third column and report it**: `project` or `global` means the user configured this kind; `default` means it fell back to the DEFAULT row; `builtin` means nothing is configured at all and `report`/`minimal` was used. For `default` and `builtin`, tell the user in one line that `jsc-gitea:html-style` can set this kind's own template. Completion condition: layout, style and source are reported before anything is rendered.
+4. Fetch the content: `jsc-gitea:wiki` `wiki-get` for a page, or `tools/issue.sh title` plus `tools/issue.sh body` for an issue. Exit 4 (page missing) or an API failure stops the skill with the page name or issue number in the report. Completion condition: the markdown and the document title are in hand.
+5. **Prepare the markdown — this step MUST run as a sub agent.** Convert `[[display|page]]` wiki links to absolute URLs from `wiki-url`; the renderer does not resolve them, so they would ship as literal brackets. Strip personal data — an exported file travels further than the page it came from. Leave everything else exactly as written; this step never rewrites the content. Completion condition: no `[[...]]` remains, and the diff against the source is limited to link conversion and personal-data removal.
+6. Ask per `jsc-ask:ask` rules where the file goes, proposing `./.jsc/html/{page-or-issue}.html`. State the impact scope: a path inside a repository gets committed unless it is ignored. Completion condition: the user has confirmed one output path.
+7. Render: `tools/html-render.sh --markdown {file} --title {title} --layout {layout} --style {style} --source-url {absolute URL} --out {path}`. Exit 1 means Gitea's renderer failed — report it and stop, with no half-rendered file left behind. Completion condition: the file exists, and the report names its path, the layout, the style and where that pair came from.
+
+## Rules
+
+- One link, one file. Batch export is a loop the caller runs, not something this skill decides on its own.
+- The rendered file inlines CSS and scripts on purpose: it is usually sent to someone outside Gitea, and an external asset breaks on their machine.
+- The layout and style are never chosen by inspecting the content. The configuration decides, and `jsc-gitea:html-style` owns the configuration.