feat: 完善群聊日报模板与图片理解

src/main/db/image-insights-store.ts

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+// src/main/db/image-insights-store.ts
+// 持久化 ImageInsight 到 JSON 文件(userData/image-insights.json)
+// 跟项目现有风格一致(ai-provider-service 用 ai-providers.json)
+
+import { app } from 'electron'
+import fs from 'fs-extra'
+import path from 'path'
+import type { ImageInsight } from '../../shared/image-insight'
+
+interface ImageInsightsFile {
+  version: 1
+  /** imageHash -> ImageInsight 索引(缓存查询 O(1)) */
+  byHash: Record<string, ImageInsight>
+  /** messageId -> imageHash 反向索引(防止同一 message 重复入库) */
+  byMessageId: Record<string, string>
+}
+
+const EMPTY_FILE: ImageInsightsFile = {
+  version: 1,
+  byHash: {},
+  byMessageId: {}
+}
+
+class ImageInsightsStore {
+  private cache: ImageInsightsFile | null = null
+
+  private get filePath(): string {
+    return path.join(app.getPath('userData'), 'image-insights.json')
+  }
+
+  private ensureLoaded(): ImageInsightsFile {
+    if (this.cache) return this.cache
+    try {
+      if (fs.existsSync(this.filePath)) {
+        const raw = fs.readJsonSync(this.filePath) as Partial<ImageInsightsFile>
+        this.cache = {
+          version: 1,
+          byHash: raw.byHash || {},
+          byMessageId: raw.byMessageId || {}
+        }
+        return this.cache
+      }
+    } catch (error) {
+      console.warn('[ImageInsightsStore] failed to load, fallback to empty:', error)
+    }
+    this.cache = { ...EMPTY_FILE }
+    return this.cache
+  }
+
+  private persist(): void {
+    if (!this.cache) return
+    try {
+      fs.ensureDirSync(path.dirname(this.filePath))
+      fs.writeJsonSync(this.filePath, this.cache, { spaces: 2 })
+    } catch (error) {
+      console.error('[ImageInsightsStore] failed to persist:', error)
+    }
+  }
+
+  /** 通过 imageHash 查询缓存 */
+  getByHash(imageHash: string): ImageInsight | null {
+    return this.ensureLoaded().byHash[imageHash] || null
+  }
+
+  /** 列出某会话的所有 insights(按时间倒序) */
+  listBySession(sessionId: string, limit?: number): ImageInsight[] {
+    const data = this.ensureLoaded()
+    const items = Object.values(data.byHash)
+      .filter((it) => it.sessionId === sessionId)
+      .sort((a, b) => b.sentAt - a.sentAt)
+    return typeof limit === 'number' ? items.slice(0, limit) : items
+  }
+
+  /**
+   * 写入或更新 Insight。
+   * - 同 imageHash 已存在:更新 description/ocrText/tags/category/importance/provider/model/updatedAt(保留 createdAt)
+   * - 新 hash:插入
+   * 同步维护 byMessageId 反向索引。
+   */
+  upsert(insight: ImageInsight): void {
+    const data = this.ensureLoaded()
+    const existing = data.byHash[insight.imageHash]
+    const now = Date.now()
+    if (existing) {
+      data.byHash[insight.imageHash] = {
+        ...existing,
+        ...insight,
+        id: existing.id, // 保留 id
+        createdAt: existing.createdAt, // 保留首次分析时间
+        updatedAt: now
+      }
+    } else {
+      data.byHash[insight.imageHash] = { ...insight, createdAt: now, updatedAt: now }
+      data.byMessageId[insight.messageId] = insight.imageHash
+    }
+    this.persist()
+  }
+
+}
+
+export const imageInsightsStore = new ImageInsightsStore()