feat: support per-provider agent settings and environment-aware analysis

prisma/migrations/20261020160000_allow_course_ai_providers/migration.sql

@@ -0,0 +1,5 @@
+-- Preserve the existing provider, credential, and explicit enabled state.
+-- Providers without a saved row remain disabled by default.
+DROP INDEX "course_ai_settings_course_id_key";
+CREATE UNIQUE INDEX "course_ai_settings_course_id_provider_key"
+ON "course_ai_settings"("course_id", "provider");

prisma/schema.prisma

@@ -46,7 +46,7 @@ model User {
 
 model CourseAiSetting {
   id              String   @id @default(uuid()) @db.Uuid
-  courseId        String   @unique @map("course_id") @db.Uuid
+  courseId        String   @map("course_id") @db.Uuid
   enabled         Boolean  @default(false)
   provider        String   @default("OPENAI")
   model           String
@@ -56,6 +56,7 @@ model CourseAiSetting {
   updatedAt       DateTime @updatedAt @map("updated_at") @db.Timestamptz(3)
   course          Course   @relation(fields: [courseId], references: [id], onDelete: Cascade)
 
+  @@unique([courseId, provider])
   @@index([enabled])
   @@map("course_ai_settings")
 }
@@ -191,7 +192,7 @@ model Course {
   submissionScores SubmissionScore[]
   studentGroups    StudentGroup[]
   submissionTotalScores SubmissionTotalScore[]
-  aiSetting CourseAiSetting?
+  aiSettings CourseAiSetting[]
 
   @@index([isActive])
   @@index([teacherId])