Portal backend: Facebook OAuth, social features, portal comments

- Facebook Login OAuth (meta-web auth service + routes)
- Account linking (merge Quest metaId + Facebook facebookId)
- User profile updates (bio, isPublic, displayName)
- Social endpoints: follow/unfollow, feed (trending/following/recent), likes
- Portal comments via WebSocket (subscribe_portal, send_portal_comment)
- Prisma migration: Follow, Like models, facebookId/bio/isPublic on User
- Provider OAuth source=web redirect support for portal callbacks
- Docker compose portal service, CORS multi-origin support

prisma/schema.prisma

@@ -9,16 +9,22 @@ datasource db {
 
 model User {
   id          String   @id @default(uuid())
-  metaId      String   @unique
+  metaId      String?  @unique
+  facebookId  String?  @unique
   displayName String
   email       String?
   avatarUrl   String?
+  bio         String   @default("")
+  isPublic    Boolean  @default(false)
   createdAt   DateTime @default(now())
   updatedAt   DateTime @updatedAt
 
   linkedAccounts LinkedAccount[]
   streamPlans    StreamPlan[]
   sessions       Session[]
+  followers      Follow[]        @relation("following")
+  following      Follow[]        @relation("follower")
+  likes          Like[]
 }
 
 model Session {
@@ -64,6 +70,7 @@ model StreamPlan {
   createdAt     DateTime            @default(now())
   updatedAt     DateTime            @updatedAt
   destinations  StreamDestination[]
+  likes         Like[]
 
   @@index([userId])
 }
@@ -86,3 +93,28 @@ model StreamDestination {
 
   @@index([planId])
 }
+
+model Follow {
+  id          String   @id @default(uuid())
+  followerId  String
+  follower    User     @relation("follower", fields: [followerId], references: [id], onDelete: Cascade)
+  followingId String
+  following   User     @relation("following", fields: [followingId], references: [id], onDelete: Cascade)
+  createdAt   DateTime @default(now())
+
+  @@unique([followerId, followingId])
+  @@index([followerId])
+  @@index([followingId])
+}
+
+model Like {
+  id        String     @id @default(uuid())
+  userId    String
+  user      User       @relation(fields: [userId], references: [id], onDelete: Cascade)
+  planId    String
+  plan      StreamPlan @relation(fields: [planId], references: [id], onDelete: Cascade)
+  createdAt DateTime   @default(now())
+
+  @@unique([userId, planId])
+  @@index([planId])
+}