docs: add article type job nav design spec

Author: yyyCode

docs/superpowers/specs/2026-07-31-article-type-job-nav-design.md

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+# Article Type Field — Job Navigation Design
+
+## Overview
+
+Add a `type` field to `articles` table to support article-type pages like 求职导航, separate from blog articles.
+
+## Design
+
+### Database
+
+Add `type` column to `articles`:
+
+```sql
+ALTER TABLE articles ADD COLUMN type VARCHAR(16) NOT NULL DEFAULT 'ARTICLE' AFTER status;
+```
+
+### ArticleType Enum
+
+```java
+public enum ArticleType {
+    ARTICLE,   // 博客文章
+    JOB_NAV    // 求职导航
+}
+```
+
+### Backend
+
+- `Article` entity: add `type` field
+- `ArticleService.listPublished()`: filter `type = ARTICLE`
+- `ArticleService.listByType(ArticleType type, page, size)`: new method for public type-filtered listing
+- `ArticleCreateRequest` / `ArticleUpdateRequest`: add optional `type` field
+- `ArticleController`: new `GET /articles/type/{type}` endpoint
+
+### Frontend
+
+- `BlogHeader.vue`: 求职导航 `href="#"` → `router-link to="/jobs"`
+- Router: add `/jobs` route
+- New `JobNavView.vue`: list job nav articles, reuses `ArticleCard` component
+- Article detail: reuse existing `ArticleDetailView.vue`
+- Console: article compose view adds type selector