refactor: 프로젝트에서 공개 범위(visibility) 제거

불필요한 프로젝트 공개 범위 데이터를 백엔드·프론트에서 일괄 제거(저장소 Repo 의 visibility 는 Gitea 연동용이라 유지).

백엔드:
- Project 엔티티 visibility 컬럼·ProjectVisibility 타입 제거(dev synchronize 가 컬럼 DROP)
- create/update DTO, ProjectResponse, create/update/ensureUnassigned/toResponse 에서 제거
- ai.service 프로젝트 컨텍스트 문자열에서 공개범위 표기 제거
- activity 타입 project.visibility_changed 제거

프론트:
- types/project·project.store·mock Project 에서 visibility 제거
- ProjectCreatePage·ProjectSettingsPage 공개 범위 입력 폼+CSS 제거
- ProjectListPage 공개여부 세그먼트 필터+배지 제거, ProjectHeader 배지 제거
- activity 타입/스토어 project.visibility_changed 케이스 제거

런타임 검증: DB projects.visibility 컬럼 DROP, 생성/목록 응답에 visibility 없음, CRUD 정상.
백엔드 build/lint 0·14 tests, 프론트 type-check/lint/build 0.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/src/modules/activity/entities/activity.entity.ts

@@ -16,7 +16,6 @@ export type ActivityType =
   // 프로젝트(설정)
   | 'project.created'
   | 'project.renamed'
-  | 'project.visibility_changed'
   // 저장소 연동
   | 'repo.linked'
   | 'repo.unlinked'

backend/src/modules/ai/ai.service.ts

@@ -395,10 +395,7 @@ export class AiService {
         lines.push('- (없음)');
       } else {
         for (const p of projects.items) {
-          const vis = p.visibility === 'private' ? '비공개' : '공개';
-          lines.push(
-            `- ${p.name} — ${vis}, 업무 ${p.doneCount}/${p.totalCount}건`,
-          );
+          lines.push(`- ${p.name} — 업무 ${p.doneCount}/${p.totalCount}건`);
         }
         if (projects.total > projects.items.length) {
           lines.push(`- … 외 ${projects.total - projects.items.length}개`);

backend/src/modules/project/dto/create-project.dto.ts

@@ -1,12 +1,5 @@
-import {
-  IsIn,
-  IsNotEmpty,
-  IsOptional,
-  IsString,
-  MaxLength,
-} from 'class-validator';
+import { IsNotEmpty, IsOptional, IsString, MaxLength } from 'class-validator';
 import { ApiProperty } from '@nestjs/swagger';
-import type { ProjectVisibility } from '../entities/project.entity';
 
 // 프로젝트 생성 DTO
 export class CreateProjectDto {
@@ -24,13 +17,4 @@ export class CreateProjectDto {
   @IsString()
   @MaxLength(300)
   description?: string;
-
-  @ApiProperty({
-    description: '공개 범위',
-    enum: ['private', 'public'],
-    required: false,
-  })
-  @IsOptional()
-  @IsIn(['private', 'public'], { message: '공개 범위를 선택해 주세요.' })
-  visibility?: ProjectVisibility;
 }

backend/src/modules/project/dto/update-project.dto.ts

@@ -1,6 +1,5 @@
-import { IsIn, IsOptional, IsString, MaxLength } from 'class-validator';
+import { IsOptional, IsString, MaxLength } from 'class-validator';
 import { ApiProperty } from '@nestjs/swagger';
-import type { ProjectVisibility } from '../entities/project.entity';
 
 // 프로젝트 수정 DTO — 제공된 필드만 갱신
 export class UpdateProjectDto {
@@ -15,13 +14,4 @@ export class UpdateProjectDto {
   @IsString()
   @MaxLength(300)
   description?: string;
-
-  @ApiProperty({
-    description: '공개 범위',
-    enum: ['private', 'public'],
-    required: false,
-  })
-  @IsOptional()
-  @IsIn(['private', 'public'], { message: '공개 범위를 선택해 주세요.' })
-  visibility?: ProjectVisibility;
 }

backend/src/modules/project/entities/project.entity.ts

@@ -9,9 +9,6 @@ import {
 } from 'typeorm';
 import { ProjectMember } from './project-member.entity';
 
-// 프로젝트 공개 범위
-export type ProjectVisibility = 'private' | 'public';
-
 // 프로젝트 엔티티 — 작업의 기본 단위(우선). 저장소(Repo)는 프로젝트에 0~N개 연동된다.
 @Entity('projects')
 export class Project {
@@ -27,10 +24,6 @@ export class Project {
   @Column({ type: 'varchar', nullable: true })
   description!: string | null;
 
-  // 공개 범위
-  @Column({ type: 'varchar', default: 'private' })
-  visibility!: ProjectVisibility;
-
   // 시스템 예약 프로젝트 여부 — "미분류"(Gitea import 기본 버킷)는 true. 삭제/이름변경 보호.
   @Column({ name: 'is_system', default: false })
   isSystem!: boolean;

backend/src/modules/project/project.service.ts

@@ -13,7 +13,7 @@ import {
   resolvePage,
   type PaginatedResult,
 } from '../../common/pagination/pagination';
-import { Project, type ProjectVisibility } from './entities/project.entity';
+import { Project } from './entities/project.entity';
 import { ProjectMember } from './entities/project-member.entity';
 import { Repo } from '../repo/entities/repo.entity';
 import { Task } from '../task/entities/task.entity';
@@ -28,7 +28,6 @@ export interface ProjectResponse {
   id: string;
   name: string;
   description: string | null;
-  visibility: ProjectVisibility;
   isSystem: boolean;
   members: PublicUser[];
   memberCount: number;
@@ -120,7 +119,6 @@ export class ProjectService implements OnApplicationBootstrap {
       this.projectRepo.create({
         name: dto.name,
         description: dto.description ?? null,
-        visibility: dto.visibility ?? 'private',
         isSystem: false,
       }),
     );
@@ -155,7 +153,6 @@ export class ProjectService implements OnApplicationBootstrap {
     }
     if (dto.name !== undefined) project.name = dto.name;
     if (dto.description !== undefined) project.description = dto.description;
-    if (dto.visibility !== undefined) project.visibility = dto.visibility;
     await this.projectRepo.save(project);
     return this.findOne(project.id, userId);
   }
@@ -187,7 +184,6 @@ export class ProjectService implements OnApplicationBootstrap {
       this.projectRepo.create({
         name: UNASSIGNED_PROJECT_NAME,
         description: 'Gitea 에서 가져온, 아직 프로젝트에 배정되지 않은 저장소',
-        visibility: 'private',
         isSystem: true,
       }),
     );
@@ -275,7 +271,6 @@ export class ProjectService implements OnApplicationBootstrap {
       id: project.id,
       name: project.name,
       description: project.description,
-      visibility: project.visibility,
       isSystem: project.isSystem,
       members: members
         .filter((m) => m.user)