feat: 多端同步服务端与引擎 + Capacitor 安卓工程（v1.13）

intern-log/src/db/schema.ts

@@ -78,6 +78,22 @@ export interface Transaction {
   created_at: string
 }
 
+// 同步镜像：记录上次同步时每条数据的哈希，用于增量差异检测
+export interface SyncMirror {
+  id?: number
+  table: string
+  uuid: string
+  hash: string
+}
+
+// 删除墓碑：同步时告知其他端该记录已删除
+export interface SyncTombstone {
+  id?: number
+  table: string
+  uuid: string
+  deleted_at: string
+}
+
 export class WorklogDB extends Dexie {
   project!: Table<Project, number>
   work_log!: Table<WorkLog, number>
@@ -88,6 +104,8 @@ export class WorklogDB extends Dexie {
   memo!: Table<Memo, number>
   credential!: Table<Credential, number>
   transaction!: Table<Transaction, number>
+  sync_mirror!: Table<SyncMirror, number>
+  tombstone!: Table<SyncTombstone, number>
 
   constructor(dbName = 'intern_worklog') {
     super(dbName)
@@ -106,6 +124,10 @@ export class WorklogDB extends Dexie {
     this.version(3).stores({
       transaction: '++id, date, type, category'
     })
+    this.version(4).stores({
+      sync_mirror: '++id, table, uuid',
+      tombstone: '++id, table, uuid, deleted_at'
+    })
   }
 }
 
@@ -121,7 +143,7 @@ export function unbindDatabase(): void {
   db = undefined
 }
 
-export const SCHEMA_VERSION = 3
+export const SCHEMA_VERSION = 4
 
 export const EXPENSE_CATEGORIES: string[] = ['餐饮', '交通', '住房', '通讯', '学习', '娱乐', '其他']
 export const INCOME_CATEGORIES: string[] = ['工资', '报销', '其他']