Refactor AI chat: streaming, tool calls, UI polish

apps/server/src/ai-chat/dto/ai-chat.dto.ts

@@ -1,18 +1,41 @@
 import { Type } from 'class-transformer';
-import { IsInt, IsNotEmpty, IsOptional, IsString, Max, MaxLength, Min } from 'class-validator';
+import {
+  ArrayMaxSize,
+  IsArray,
+  IsIn,
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsString,
+  IsUUID,
+  Max,
+  MaxLength,
+  Min,
+} from 'class-validator';
 
 export class CreateConversationDto {
   @IsOptional()
   @IsString()
   @MaxLength(100)
   title?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(50)
+  lockedSkillKey?: string | null;
 }
 
-export class RenameConversationDto {
+export class UpdateConversationDto {
+  @IsOptional()
   @IsString()
   @IsNotEmpty()
   @MaxLength(100)
-  title: string;
+  title?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(50)
+  lockedSkillKey?: string | null;
 }
 
 export class SendMessageDto {
@@ -20,6 +43,36 @@ export class SendMessageDto {
   @IsNotEmpty()
   @MaxLength(16000)
   message: string;
+
+  @IsOptional()
+  @IsArray()
+  @ArrayMaxSize(5)
+  @IsInt({ each: true })
+  @Min(1, { each: true })
+  attachmentIds?: number[];
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(50)
+  skillKey?: string | null;
+
+  @IsUUID()
+  clientRequestId: string;
+}
+
+export class RegenerateMessageDto {
+  @IsUUID()
+  clientRequestId: string;
+}
+
+export class MessageFeedbackDto {
+  @IsIn(['like', 'dislike', null])
+  feedback: 'like' | 'dislike' | null;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
+  reason?: string;
 }
 
 export class MessagePageQueryDto {