feat: basic initial UI layout for mobile and desktop

apps/api/prisma/schema.prisma

@@ -19,45 +19,51 @@ model User {
   createdAt      DateTime  @default(now())
   updatedAt      DateTime  @updatedAt
 
-  accounts Account[]
-  sessions Session[]
-  groupsMember   Member[]
-  groupsOwner    Group[]      @relation("OwnerGroups")
-  waitlist       WaitlistEntry[]
+  accounts        Account[]
+  sessions        Session[]
+  passkeys        Passkey[]
+  groupsMember    GroupMember[]
+  groupsOwner     Group[]        @relation("OwnerGroups")
+  orgMemberships  Member[]
+  orgInvitations  Invitation[]   @relation("InvitedBy")
+  waitlist        WaitlistEntry[]
 
   @@map("users")
 }
 
 model Account {
-  id                String  @id @default(cuid())
-  userId            String
-  providerId        String
-  providerAccountId String
-  refreshToken      String?
-  accessToken       String?
+  id                   String   @id @default(cuid())
+  userId               String
+  providerId           String
+  accountId            String
+  issuer               String
+  accessToken          String?
+  refreshToken         String?
+  idToken              String?
   accessTokenExpiresAt DateTime?
   refreshTokenExpiresAt DateTime?
-  scope             String?
-  idToken           String?
-  password          String?
-  createdAt         DateTime @default(now())
-  updatedAt         DateTime @updatedAt
+  scope                String?
+  password             String?
+  createdAt            DateTime @default(now())
+  updatedAt            DateTime @updatedAt
 
   user User @relation(fields: [userId], references: [id], onDelete: Cascade)
 
-  @@unique([providerId, providerAccountId])
+  @@unique([issuer, accountId])
+  @@index([userId])
   @@map("accounts")
 }
 
 model Session {
-  id        String   @id @default(cuid())
-  userId    String
-  token     String   @unique
-  expiresAt DateTime
-  ipAddress String?
-  userAgent String?
-  createdAt DateTime @default(now())
-  updatedAt DateTime @updatedAt
+  id                   String   @id @default(cuid())
+  userId               String
+  token                String   @unique
+  expiresAt            DateTime
+  ipAddress            String?
+  userAgent            String?
+  activeOrganizationId String?
+  createdAt            DateTime @default(now())
+  updatedAt            DateTime @updatedAt
 
   user User @relation(fields: [userId], references: [id], onDelete: Cascade)
 
@@ -76,6 +82,73 @@ model Verification {
   @@map("verifications")
 }
 
+// Better Auth - Organization plugin
+model Organization {
+  id        String   @id @default(cuid())
+  name      String
+  slug      String   @unique
+  logo      String?
+  metadata  Json?
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  members     Member[]
+  invitations Invitation[]
+
+  @@map("organizations")
+}
+
+model Member {
+  id             String   @id @default(cuid())
+  organizationId String
+  userId         String
+  role           String   @default("member")
+  createdAt      DateTime @default(now())
+
+  organization Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
+  user         User         @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@unique([organizationId, userId])
+  @@map("members")
+}
+
+model Invitation {
+  id             String   @id @default(cuid())
+  organizationId String
+  email          String
+  role           String
+  status         String   @default("pending")
+  inviterId      String
+  expiresAt      DateTime
+  createdAt      DateTime @default(now())
+
+  organization Organization @relation(fields: [organizationId], references: [id], onDelete: Cascade)
+  inviter      User         @relation("InvitedBy", fields: [inviterId], references: [id], onDelete: Cascade)
+
+  @@index([organizationId])
+  @@map("invitations")
+}
+
+// Better Auth - Passkey plugin
+model Passkey {
+  id           String   @id @default(cuid())
+  name         String?
+  publicKey    String
+  credentialID String   @unique
+  userId       String
+  counter      Int
+  deviceType   String
+  backedUp     Boolean
+  transports   String?
+  createdAt    DateTime @default(now())
+  aaguid       String?
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@index([userId])
+  @@map("passkeys")
+}
+
 // Domain models
 model Group {
   id          String   @id @default(cuid())
@@ -85,26 +158,26 @@ model Group {
   createdAt   DateTime @default(now())
   updatedAt   DateTime @updatedAt
 
-  owner    User     @relation("OwnerGroups", fields: [createdById], references: [id], onDelete: Cascade)
-  members  Member[]
+  owner    User          @relation("OwnerGroups", fields: [createdById], references: [id], onDelete: Cascade)
+  members  GroupMember[]
   students Student[]
   payments Payment[]
 
   @@map("groups")
 }
 
-model Member {
-  id      String @id @default(cuid())
-  groupId String
-  userId  String
-  role    Role   @default(MEMBER) // OWNER, ADMIN, MEMBER
+model GroupMember {
+  id       String @id @default(cuid())
+  groupId  String
+  userId   String
+  role     Role   @default(MEMBER) // OWNER, ADMIN, MEMBER
   joinedAt DateTime @default(now())
 
   group Group @relation(fields: [groupId], references: [id], onDelete: Cascade)
   user  User  @relation(fields: [userId], references: [id], onDelete: Cascade)
 
   @@unique([groupId, userId])
-  @@map("members")
+  @@map("group_members")
 }
 
 enum Role {