feat: add GIF Mood Board workshop

- New workshop where each team member shares up to 5 GIFs with notes to express their weekly mood
- Per-user week rating (1-5 stars) visible next to each member's section
- Masonry-style grid with adjustable column count (3/4/5) toggle
- Handwriting font (Caveat) for GIF notes
- Full real-time collaboration via SSE
- Clean migration (add_gif_mood_workshop) safe for production deploy
- DB backup via cp before each migration in docker-entrypoint

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

prisma/schema.prisma

@@ -34,6 +34,12 @@ model User {
   sharedWeatherSessions WeatherSessionShare[]
   weatherSessionEvents  WeatherSessionEvent[]
   weatherEntries        WeatherEntry[]
+  // GIF Mood Board relations
+  gifMoodSessions        GifMoodSession[]
+  gifMoodItems           GifMoodItem[]
+  sharedGifMoodSessions  GMSessionShare[]
+  gifMoodSessionEvents   GMSessionEvent[]
+  gifMoodRatings         GifMoodUserRating[]
   // Teams & OKRs relations
   createdTeams  Team[]
   teamMembers   TeamMember[]
@@ -525,3 +531,81 @@ model WeatherSessionEvent {
 
   @@index([sessionId, createdAt])
 }
+
+// ============================================
+// GIF Mood Board Workshop
+// ============================================
+
+model GifMoodSession {
+  id        String               @id @default(cuid())
+  title     String
+  date      DateTime             @default(now())
+  userId    String
+  user      User                 @relation(fields: [userId], references: [id], onDelete: Cascade)
+  items     GifMoodItem[]
+  shares    GMSessionShare[]
+  events    GMSessionEvent[]
+  ratings   GifMoodUserRating[]
+  createdAt DateTime             @default(now())
+  updatedAt DateTime             @updatedAt
+
+  @@index([userId])
+  @@index([date])
+}
+
+model GifMoodUserRating {
+  id        String         @id @default(cuid())
+  sessionId String
+  session   GifMoodSession @relation(fields: [sessionId], references: [id], onDelete: Cascade)
+  userId    String
+  user      User           @relation(fields: [userId], references: [id], onDelete: Cascade)
+  rating    Int            // 1-5
+  createdAt DateTime       @default(now())
+  updatedAt DateTime       @updatedAt
+
+  @@unique([sessionId, userId])
+  @@index([sessionId])
+}
+
+model GifMoodItem {
+  id        String         @id @default(cuid())
+  sessionId String
+  session   GifMoodSession @relation(fields: [sessionId], references: [id], onDelete: Cascade)
+  userId    String
+  user      User           @relation(fields: [userId], references: [id], onDelete: Cascade)
+  gifUrl    String
+  note      String?
+  order     Int            @default(0)
+  createdAt DateTime       @default(now())
+  updatedAt DateTime       @updatedAt
+
+  @@index([sessionId, userId])
+  @@index([sessionId])
+}
+
+model GMSessionShare {
+  id        String         @id @default(cuid())
+  sessionId String
+  session   GifMoodSession @relation(fields: [sessionId], references: [id], onDelete: Cascade)
+  userId    String
+  user      User           @relation(fields: [userId], references: [id], onDelete: Cascade)
+  role      ShareRole      @default(EDITOR)
+  createdAt DateTime       @default(now())
+
+  @@unique([sessionId, userId])
+  @@index([sessionId])
+  @@index([userId])
+}
+
+model GMSessionEvent {
+  id        String         @id @default(cuid())
+  sessionId String
+  session   GifMoodSession @relation(fields: [sessionId], references: [id], onDelete: Cascade)
+  userId    String
+  user      User           @relation(fields: [userId], references: [id], onDelete: Cascade)
+  type      String         // GIF_ADDED, GIF_UPDATED, GIF_DELETED, SESSION_UPDATED
+  payload   String         // JSON payload
+  createdAt DateTime       @default(now())
+
+  @@index([sessionId, createdAt])
+}