fix: SQLite 持久化 files 和 _videos，历史记录不再丢失视频指示牌和文件

- ALTER TABLE 新增 attachments TEXT 列
- saveMessage 序列化 files/_videos 为 JSON
- getMessages 反序列化还原

src/main/db/sqlite.ts

@@ -223,8 +223,10 @@ export async function initDatabase(): Promise<SQL.Database> {
     CREATE INDEX IF NOT EXISTS idx_skills_updated ON skills(updated_at DESC);
   `);
 
-  // 兼容迁移：为已有 messages 表补充 prompt_eval_count 列（新库已有，旧库需要 ALTER）
-  try { db.run('ALTER TABLE messages ADD COLUMN prompt_eval_count INTEGER'); } catch { /* 列已存在，忽略 */ }
+  // 兼容迁移：为已有 messages 表补充 attachments 列（文件/视频等附件 JSON）
+  try { db.run('ALTER TABLE messages ADD COLUMN attachments TEXT'); } catch { /* 列已存在，忽略 */ }
+
+  // 兼容迁移：为已有 messages 表补充 prompt_eval_count 列
 
   // 兼容迁移：为已有 skills 表补充 summary 列
   try { db.run("ALTER TABLE skills ADD COLUMN summary TEXT DEFAULT ''"); } catch { /* 列已存在，忽略 */ }
@@ -272,6 +274,7 @@ export interface MessageRow {
   images: string | null;
   tool_calls: string | null;
   tool_name: string | null;
+  attachments: string | null;
   eval_count: number | null;
   prompt_eval_count: number | null;
   total_duration: number | null;
@@ -374,10 +377,10 @@ export function clearAllSessions(): void {
 
 export function saveMessage(msg: MessageRow): string {
   const d = getDb();
-  runExec(d, `INSERT OR REPLACE INTO messages (id, session_id, role, content, thinking, images, tool_calls, tool_name, eval_count, prompt_eval_count, total_duration, created_at)
-    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+  runExec(d, `INSERT OR REPLACE INTO messages (id, session_id, role, content, thinking, images, tool_calls, tool_name, attachments, eval_count, prompt_eval_count, total_duration, created_at)
+    VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
     [msg.id, msg.session_id, msg.role, msg.content, msg.thinking, msg.images,
-     msg.tool_calls, msg.tool_name, msg.eval_count, msg.prompt_eval_count, msg.total_duration, msg.created_at]
+     msg.tool_calls, msg.tool_name, msg.attachments, msg.eval_count, msg.prompt_eval_count, msg.total_duration, msg.created_at]
   );
   persist();
   return msg.id;

src/renderer/db/chat-db.ts

@@ -89,6 +89,7 @@ export class ChatDB {
           images: msg.images?.length ? JSON.stringify(msg.images) : null,
           tool_calls: msg.toolCalls?.length ? JSON.stringify(msg.toolCalls) : null,
           tool_name: null,
+          attachments: JSON.stringify({ files: msg.files, videos: (msg as any)._videos }),
           eval_count: msg.eval_count || null,
           prompt_eval_count: msg.prompt_eval_count || null,
           total_duration: msg.total_duration || null,
@@ -106,17 +107,23 @@ export class ChatDB {
       const row = await dbBridge().getSession(id);
       if (!row) return null;
       const msgRows = await dbBridge().getMessages(id);
-      const messages = msgRows.map((r: any) => ({
-        role: r.role,
-        content: r.content || '',
-        timestamp: r.created_at,
-        think: r.thinking || undefined,
-        images: r.images ? JSON.parse(r.images) : undefined,
-        eval_count: r.eval_count || undefined,
-        prompt_eval_count: r.prompt_eval_count || undefined,
-        total_duration: r.total_duration || undefined,
-        toolCalls: r.tool_calls ? JSON.parse(r.tool_calls) : undefined
-      }));
+      const messages = msgRows.map((r: any) => {
+        let files, videos;
+        try { const a = JSON.parse(r.attachments || '{}'); files = a.files; videos = a.videos; } catch { /* ignore */ }
+        return {
+          role: r.role,
+          content: r.content || '',
+          timestamp: r.created_at,
+          think: r.thinking || undefined,
+          images: r.images ? JSON.parse(r.images) : undefined,
+          eval_count: r.eval_count || undefined,
+          prompt_eval_count: r.prompt_eval_count || undefined,
+          total_duration: r.total_duration || undefined,
+          toolCalls: r.tool_calls ? JSON.parse(r.tool_calls) : undefined,
+          ...(files?.length && { files }),
+          ...(videos?.length && { _videos: videos })
+        };
+      });
       return {
         id: row.id,
         title: row.title,