Stage 5: Add Prisma integration and enhance mission management

- Introduced Prisma as a dependency in package.json and updated pnpm-lock.yaml.
- Created Prisma module and service for database interactions.
- Added initial Prisma schema and migration for user, survivor, mission, and related entities.
- Implemented throttling in the API using @nestjs/throttler for rate limiting.
- Enhanced mission management logic to utilize Prisma for database transactions.
- Updated missions controller and service to handle mission state and participant management.
- Added Twitch PubSub service for real-time updates on mission states.

apps/api/prisma/schema.prisma

@@ -0,0 +1,80 @@
+generator client {
+  provider = "prisma-client-js"
+  output   = "../../../node_modules/.prisma/client"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id           String     @id @default(uuid()) @db.Uuid
+  opaqueUserId String     @unique @map("twitch_opaque_user_id")
+  createdAt    DateTime   @default(now()) @map("created_at")
+  survivors    Survivor[]
+
+  @@map("users")
+}
+
+model Survivor {
+  id           String               @id @default(uuid()) @db.Uuid
+  userId       String               @map("user_id") @db.Uuid
+  user         User                 @relation(fields: [userId], references: [id])
+  channelId    String               @map("channel_id")
+  name         String               @db.VarChar(32)
+  state        String               @default("active")
+  stats        Json
+  perkSlots    Json                 @map("perk_slots")
+  createdAt    DateTime             @default(now()) @map("created_at")
+  participants MissionParticipant[]
+
+  @@map("survivors")
+}
+
+model Mission {
+  id                      String               @id @default(uuid()) @db.Uuid
+  groupId                 String?              @map("group_id") @db.Uuid
+  channelId               String               @map("channel_id")
+  difficulty              Int                  @db.SmallInt
+  status                  String               @default("active")
+  encounterLibraryVersion String               @map("encounter_library_version")
+  startedAt               DateTime             @default(now()) @map("started_at")
+  endedAt                 DateTime?            @map("ended_at")
+  tickIndex               Int                  @default(0) @map("tick_index")
+  nextTickAt              DateTime             @map("next_tick_at")
+  participants            MissionParticipant[]
+  logs                    MissionLog[]
+
+  @@index([channelId])
+  @@index([status, nextTickAt])
+  @@map("missions")
+}
+
+model MissionParticipant {
+  id         String   @id @default(uuid()) @db.Uuid
+  missionId  String   @map("mission_id") @db.Uuid
+  mission    Mission  @relation(fields: [missionId], references: [id])
+  survivorId String   @map("survivor_id") @db.Uuid
+  survivor   Survivor @relation(fields: [survivorId], references: [id])
+  state      String   @default("active")
+  hookCount  Int      @default(0) @map("hook_count") @db.SmallInt
+
+  @@unique([missionId, survivorId])
+  @@map("mission_participants")
+}
+
+model MissionLog {
+  id               String   @id @default(uuid()) @db.Uuid
+  missionId        String   @map("mission_id") @db.Uuid
+  mission          Mission  @relation(fields: [missionId], references: [id])
+  tickIndex        Int      @map("tick_index")
+  encounterKey     String   @map("encounter_key")
+  renderedText     String   @map("rendered_text")
+  seed             String
+  modifiersApplied Json     @map("modifiers_applied")
+  createdAt        DateTime @default(now()) @map("created_at")
+
+  @@index([missionId, tickIndex])
+  @@map("mission_logs")
+}