完全移除模块级权限系统，迁移至接口级权限

后端：
- 删除 StudyRolePermission 模型和 project_permissions API 文件
- 重写 project_permissions.py core，移除所有模块级权限函数
- 重写 permission_cache.py，移除模块级权限缓存逻辑
- 新增权限模板功能（PermissionTemplate 模型、API、服务层）
- 新增 permission_templates 数据库迁移
- 迁移 8 个模块（attachments、audit_logs、dashboard、faqs、
  faq_categories、fees_attachments、knowledge_notes、
  material_equipments、overview、subject_histories、subject_pds）
  至接口级权限检查
- 删除所有模块级权限相关测试文件，新增权限模板测试

前端：
- 删除 ProjectPermissions.vue 和 ProjectPermissionsModule.vue
- 重写 projectRoutePermissions.ts，改为基于接口级权限格式
- 更新 store/study.ts、router/index.ts、AuditLogs.vue、Projects.vue
  中的权限 API 调用，从 fetchProjectRolePermissions 改为
  fetchApiEndpointPermissions
- 清理 types/api.ts 中的旧模块级权限类型定义
- 新增 PermissionTemplateSelector.vue 组件
- 更新权限管理页面，移除模块级权限 tab

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

backend/app/models/permission_template.py

@@ -0,0 +1,63 @@
+from datetime import datetime
+from enum import Enum
+from typing import Optional
+from uuid import UUID, uuid4
+
+from sqlalchemy import JSON, Boolean, DateTime, Enum as SQLEnum, ForeignKey, Integer, String, UniqueConstraint, func
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db.base_class import Base
+
+
+class TemplateType(str, Enum):
+    ROLE = "ROLE"
+    SCENARIO = "SCENARIO"
+    CUSTOM = "CUSTOM"
+
+
+class PermissionTemplate(Base):
+    __tablename__ = "permission_templates"
+
+    id: Mapped[UUID] = mapped_column(primary_key=True, default=uuid4)
+    name: Mapped[str] = mapped_column(String(100), nullable=False)
+    description: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
+    template_type: Mapped[TemplateType] = mapped_column(SQLEnum(TemplateType), nullable=False)
+    is_system: Mapped[bool] = mapped_column(Boolean, nullable=False, server_default="false")
+    created_by: Mapped[Optional[UUID]] = mapped_column(nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now())
+
+    # 权限配置 JSON: {role: {endpoint_key: allowed}}
+    permissions: Mapped[dict] = mapped_column(JSON, nullable=False)
+
+    # 元数据
+    tags: Mapped[Optional[str]] = mapped_column(String(200), nullable=True)
+    category: Mapped[Optional[str]] = mapped_column(String(50), nullable=True)
+    recommended_roles: Mapped[Optional[str]] = mapped_column(String(200), nullable=True)
+
+    # 关系
+    versions: Mapped[list["PermissionTemplateVersion"]] = relationship(
+        "PermissionTemplateVersion",
+        back_populates="template",
+        cascade="all, delete-orphan",
+    )
+
+
+class PermissionTemplateVersion(Base):
+    __tablename__ = "permission_template_versions"
+    __table_args__ = (
+        UniqueConstraint("template_id", "version", name="uq_template_versions"),
+    )
+
+    id: Mapped[UUID] = mapped_column(primary_key=True, default=uuid4)
+    template_id: Mapped[UUID] = mapped_column(ForeignKey("permission_templates.id"), nullable=False)
+    version: Mapped[int] = mapped_column(Integer, nullable=False)
+    permissions: Mapped[dict] = mapped_column(JSON, nullable=False)
+    change_log: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
+
+    # 关系
+    template: Mapped["PermissionTemplate"] = relationship(
+        "PermissionTemplate",
+        back_populates="versions",
+    )