refactor: remove obsolete project mode

tests/helpers/auth.ts

@@ -81,7 +81,7 @@ export function installAuthMocks() {
       if (state.projectAuthMode === 'not_found') return notFoundResponse()
       return {
         session: state.session,
-        project: { id: projectId, userId: state.session.user.id, name: 'project', mode: 'novel-promotion' },
+        project: { id: projectId, userId: state.session.user.id, name: 'project' },
         novelData: { id: 'novel-data-id' },
       }
     },

tests/helpers/fixtures.ts

@@ -15,12 +15,11 @@ export async function createFixtureUser() {
   })
 }
 
-export async function createFixtureProject(userId: string, mode: 'novel-promotion' | 'general' = 'novel-promotion') {
+export async function createFixtureProject(userId: string) {
   const id = suffix()
   return await prisma.project.create({
     data: {
       userId,
-      mode,
       name: `project_${id}`,
     },
   })