feat: 实现笔临 P0/P1 Electron 桌面应用 v0.1.0

交付写作核心（TipTap、自动保存、分卷分章）、Onboarding、7 主题与双语 i18n、快捷键设置；主进程使用 node:sqlite；补全 Vitest 与 Playwright E2E；统一 design/ 目录并移除 desigin 拼写错误路径。

Co-authored-by: Cursor <cursoragent@cursor.com>

src/main/db/repositories/volume.repo.ts

@@ -0,0 +1,52 @@
+import { randomUUID } from 'crypto'
+import type { Volume } from '../../../shared/types'
+import type { SqliteDb } from '../types'
+function mapRow(row: Record<string, unknown>): Volume {
+  return {
+    id: row.id as string,
+    name: row.name as string,
+    description: row.description as string,
+    sortOrder: row.sort_order as number
+  }
+}
+
+export class VolumeRepository {
+  constructor(private db: SqliteDb) {}
+  create(name: string, sortOrder: number): Volume {
+    const id = randomUUID()
+    this.db
+      .prepare(
+        `INSERT INTO volumes (id, name, sort_order) VALUES (?, ?, ?)`
+      )
+      .run(id, name, sortOrder)
+    return this.get(id)!
+  }
+
+  get(id: string): Volume | null {
+    const row = this.db.prepare('SELECT * FROM volumes WHERE id = ?').get(id) as
+      | Record<string, unknown>
+      | undefined
+    return row ? mapRow(row) : null
+  }
+
+  list(): Volume[] {
+    return (
+      this.db.prepare('SELECT * FROM volumes ORDER BY sort_order').all() as Record<string, unknown>[]
+    ).map(mapRow)
+  }
+
+  update(id: string, patch: { name?: string; description?: string }): Volume {
+    const existing = this.get(id)
+    if (!existing) throw new Error('Volume not found')
+    this.db
+      .prepare(
+        `UPDATE volumes SET name = ?, description = ?, updated_at = datetime('now') WHERE id = ?`
+      )
+      .run(patch.name ?? existing.name, patch.description ?? existing.description, id)
+    return this.get(id)!
+  }
+
+  delete(id: string): void {
+    this.db.prepare('DELETE FROM volumes WHERE id = ?').run(id)
+  }
+}