feat: 完善前端功能，添加爬虫页面和项目分页

- 新增 CrawlerView 爬虫页面
- 完善 HomeView 分页展示（9个/页）
- 更新 ProjectCard 组件图标
- 优化 API 客户端和类型定义
- 重构样式文件结构到独立目录

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

backend/app/api/v1/projects/__init__.py

@@ -27,7 +27,7 @@ logger = logging.getLogger("yg_dataset.projects")
 project_crud = CRUDBase(Project)
 
 
-@router.get("", response_model=ApiResponse)
+@router.get("", response_model=PaginatedResponse)
 async def list_projects(
     page: int = Query(1, ge=1, description="Page number"),
     page_size: int = Query(20, ge=1, le=100, description="Page size"),

backend/app/models/models.py

@@ -14,6 +14,7 @@ class Project(Base, UUIDMixin, TimestampMixin):
 
     name = Column(String(255), nullable=False)
     description = Column(Text)
+    type = Column(String(50), default="qa")  # qa, table, database
 
     # Relationships
     files = relationship("File", back_populates="project", cascade="all, delete-orphan")

backend/app/schemas/project.py

@@ -11,6 +11,7 @@ class ProjectBase(BaseModel):
     """Base project schema"""
     name: str = Field(..., min_length=1, max_length=255)
     description: Optional[str] = Field(None, max_length=2000)
+    type: str = Field(default="qa")  # qa, table, database
 
 
 class ProjectCreate(ProjectBase):
@@ -22,6 +23,7 @@ class ProjectUpdate(BaseModel):
     """Project update schema"""
     name: Optional[str] = Field(None, min_length=1, max_length=255)
     description: Optional[str] = Field(None, max_length=2000)
+    type: Optional[str] = Field(None)
 
 
 class ProjectResponse(ProjectBase):