Add unified expertise tag system and round entry notifications

- ExpertiseSelect now fetches tags from database with category grouping
- Tags set by admin during invitation are locked and cannot be removed
- Onboarding merges user-selected tags with admin-preset tags
- MENTOR role now goes through onboarding flow
- Added migration for Round.entryNotificationType column
- Added seed script with ~90 comprehensive expertise tags

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/server/routers/user.ts

@@ -734,12 +734,23 @@ export const userRouter = router({
       })
     )
     .mutation(async ({ ctx, input }) => {
+      // Get existing user to preserve admin-set tags
+      const existingUser = await ctx.prisma.user.findUniqueOrThrow({
+        where: { id: ctx.user.id },
+        select: { expertiseTags: true },
+      })
+
+      // Merge admin-set tags with user-selected tags (preserving order: admin first, then user)
+      const adminTags = existingUser.expertiseTags || []
+      const userTags = input.expertiseTags || []
+      const mergedTags = [...new Set([...adminTags, ...userTags])]
+
       const user = await ctx.prisma.user.update({
         where: { id: ctx.user.id },
         data: {
           name: input.name,
           phoneNumber: input.phoneNumber,
-          expertiseTags: input.expertiseTags || [],
+          expertiseTags: mergedTags,
           notificationPreference: input.notificationPreference || 'EMAIL',
           onboardingCompletedAt: new Date(),
           status: 'ACTIVE', // Activate user after onboarding
@@ -771,8 +782,9 @@ export const userRouter = router({
       select: { onboardingCompletedAt: true, role: true },
     })
 
-    // Only jury members need onboarding
-    if (user.role !== 'JURY_MEMBER') {
+    // Jury members and mentors need onboarding
+    const rolesRequiringOnboarding = ['JURY_MEMBER', 'MENTOR']
+    if (!rolesRequiringOnboarding.includes(user.role)) {
       return false
     }