feat(server): refactor copilot (#14892)

#### PR Dependency Tree


* **PR #14892** 👈

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packages/backend/server/schema.prisma

@@ -494,7 +494,7 @@ model AiPrompt {
   config         Json?    @db.Json
   createdAt      DateTime @default(now()) @map("created_at") @db.Timestamptz(3)
   updatedAt      DateTime @default(now()) @map("updated_at") @db.Timestamptz(3)
-  // whether the prompt is modified by the admin panel
+  // whether the prompt metadata is manually overridden in compat storage
   modified       Boolean  @default(false)
 
   messages AiPromptMessage[]
@@ -504,19 +504,21 @@ model AiPrompt {
 }
 
 model AiSessionMessage {
-  id            String       @id @default(uuid()) @db.VarChar
-  sessionId     String       @map("session_id") @db.VarChar
-  role          AiPromptRole
-  content       String       @db.Text
-  streamObjects Json?        @db.Json
-  attachments   Json?        @db.Json
-  params        Json?        @db.Json
-  createdAt     DateTime     @default(now()) @map("created_at") @db.Timestamptz(3)
-  updatedAt     DateTime     @updatedAt @map("updated_at") @db.Timestamptz(3)
+  id                 String       @id @default(uuid()) @db.VarChar
+  sessionId          String       @map("session_id") @db.VarChar
+  compatSubmissionId String?      @map("compat_submission_id") @db.VarChar
+  role               AiPromptRole
+  content            String       @db.Text
+  streamObjects      Json?        @db.Json
+  attachments        Json?        @db.Json
+  params             Json?        @db.Json
+  createdAt          DateTime     @default(now()) @map("created_at") @db.Timestamptz(3)
+  updatedAt          DateTime     @updatedAt @map("updated_at") @db.Timestamptz(3)
 
   session AiSession @relation(fields: [sessionId], references: [id], onDelete: Cascade)
 
   @@index([sessionId])
+  @@index([sessionId, compatSubmissionId])
   @@index([createdAt, role])
   @@map("ai_sessions_messages")
 }
@@ -538,10 +540,11 @@ model AiSession {
   updatedAt       DateTime  @default(now()) @updatedAt @map("updated_at") @db.Timestamptz(3)
   deletedAt       DateTime? @map("deleted_at") @db.Timestamptz(3)
 
-  user     User               @relation(fields: [userId], references: [id], onDelete: Cascade)
-  prompt   AiPrompt           @relation(fields: [promptName], references: [name], onDelete: Cascade)
-  messages AiSessionMessage[]
-  context  AiContext[]
+  user       User               @relation(fields: [userId], references: [id], onDelete: Cascade)
+  prompt     AiPrompt           @relation(fields: [promptName], references: [name], onDelete: Cascade)
+  messages   AiSessionMessage[]
+  context    AiContext[]
+  actionRuns AiActionRun[]
 
   //NOTE:
   // unrecorded index:
@@ -554,6 +557,64 @@ model AiSession {
   @@map("ai_sessions_metadata")
 }
 
+model AiActionRun {
+  id                  String   @id @default(uuid()) @db.VarChar
+  userId              String   @map("user_id") @db.VarChar
+  workspaceId         String   @map("workspace_id") @db.VarChar
+  docId               String?  @map("doc_id") @db.VarChar
+  sessionId           String?  @map("session_id") @db.VarChar
+  userMessageId       String?  @map("user_message_id") @db.VarChar
+  compatSubmissionId  String?  @map("compat_submission_id") @db.VarChar
+  assistantMessageId  String?  @map("assistant_message_id") @db.VarChar
+  actionId            String   @map("action_id") @db.VarChar
+  actionVersion       String   @map("action_version") @db.VarChar
+  status              String   @db.VarChar
+  attempt             Int      @default(1)
+  retryOf             String?  @map("retry_of") @db.VarChar
+  inputSnapshot       Json?    @map("input_snapshot") @db.Json
+  result              Json?    @db.Json
+  artifacts           Json?    @db.Json
+  resultSummary       String?  @map("result_summary") @db.Text
+  errorCode           String?  @map("error_code") @db.VarChar
+  trace               Json?    @db.Json
+  createdAt           DateTime @default(now()) @map("created_at") @db.Timestamptz(3)
+  updatedAt           DateTime @updatedAt @map("updated_at") @db.Timestamptz(3)
+
+  session AiSession? @relation(fields: [sessionId], references: [id], onDelete: SetNull)
+
+  @@index([userId, workspaceId])
+  @@index([sessionId])
+  @@index([actionId, actionVersion])
+  @@index([status])
+  @@index([retryOf])
+  @@map("ai_action_runs")
+}
+
+model AiTranscriptTask {
+  id              String    @id @default(uuid()) @db.VarChar
+  userId          String    @map("user_id") @db.VarChar
+  workspaceId     String    @map("workspace_id") @db.VarChar
+  blobId          String    @map("blob_id") @db.VarChar
+  status          String    @db.VarChar
+  strategy        String    @db.VarChar
+  recipeId        String    @map("recipe_id") @db.VarChar
+  recipeVersion   String    @map("recipe_version") @db.VarChar
+  actionRunId     String?   @map("action_run_id") @db.VarChar
+  inputSnapshot   Json?     @map("input_snapshot") @db.Json
+  publicMeta      Json?     @map("public_meta") @db.Json
+  protectedResult Json?     @map("protected_result") @db.Json
+  errorCode       String?   @map("error_code") @db.VarChar
+  settledAt       DateTime? @map("settled_at") @db.Timestamptz(3)
+  createdAt       DateTime  @default(now()) @map("created_at") @db.Timestamptz(3)
+  updatedAt       DateTime  @updatedAt @map("updated_at") @db.Timestamptz(3)
+
+  @@index([userId, workspaceId])
+  @@index([workspaceId, blobId])
+  @@index([status])
+  @@index([actionRunId])
+  @@map("ai_transcript_tasks")
+}
+
 model AiContext {
   id        String @id @default(uuid()) @db.VarChar
   sessionId String @map("session_id") @db.VarChar