feat: initialize AutoTeacher Next.js project structure

prisma/schema.prisma

@@ -0,0 +1,75 @@
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model Course {
+  id          Int          @id @default(autoincrement())
+  name        String
+  description String?
+  classes     Class[]
+  assignments Assignment[]
+  teacherId   String
+  createdAt   DateTime     @default(now())
+  updatedAt   DateTime     @updatedAt
+
+  @@unique([teacherId, name])
+  @@index([teacherId])
+}
+
+model Class {
+  id          Int          @id @default(autoincrement())
+  name        String
+  description String?
+  courseId    Int
+  teacherId   String
+  course      Course       @relation(fields: [courseId], references: [id], onDelete: Cascade)
+  assignments Assignment[]
+  createdAt   DateTime     @default(now())
+  updatedAt   DateTime     @updatedAt
+
+  @@unique([courseId, name])
+  @@index([teacherId])
+}
+
+model Assignment {
+  id           Int          @id @default(autoincrement())
+  title        String
+  description  String?
+  courseId     Int
+  classroomId  Int
+  formSchema   Json?
+  teacherId    String
+  gradingCriteria String?
+  autoEvaluate Boolean      @default(false)
+  course       Course    @relation(fields: [courseId], references: [id], onDelete: Cascade)
+  classroom    Class     @relation(fields: [classroomId], references: [id], onDelete: Cascade)
+  submissions  Submission[]
+  createdAt    DateTime   @default(now())
+  updatedAt    DateTime   @updatedAt
+
+  @@unique([classroomId, title])
+  @@index([teacherId])
+}
+
+model Submission {
+  id                 Int       @id @default(autoincrement())
+  assignmentId       Int
+  studentId          String
+  studentName        String    @default("")
+  originalFilename   String
+  fileUrl            String
+  fileKey            String?
+  submittedAt        DateTime  @default(now())
+  formPayload        Json?
+  evaluationScore    Float?
+  evaluationComment  String?
+  evaluatedAt        DateTime?
+  assignment         Assignment @relation(fields: [assignmentId], references: [id], onDelete: Cascade)
+
+  @@unique([assignmentId, studentId])
+}