fix(im): add toId/chatType filters to MessageSearchParams and searchMessages

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/im/src/db/ImDatabase.ts

@@ -20,6 +20,8 @@ function conversationId(appId: string, userId: string, targetId: string, chatTyp
 
 export interface MessageSearchParams {
   keyword?: string
+  toId?: string
+  chatType?: string
   startTime?: number
   endTime?: number
   msgTypes?: string[]
@@ -165,6 +167,12 @@ export const ImDatabase = {
       Q.where('app_id', appId),
     ]
 
+    if (params.toId) {
+      conditions.push(Q.where('to_id', params.toId))
+    }
+    if (params.chatType) {
+      conditions.push(Q.where('chat_type', params.chatType))
+    }
     if (params.keyword) {
       conditions.push(Q.where('content', Q.like(`%${Q.sanitizeLikeString(params.keyword)}%`)))
     }