refactor: tech debt batch 3 — type safety + assignment router split

#5 — Replaced 55x PrismaClient | any with proper Prisma types across 8 files
- Service files: PrismaClient | any → PrismaClient, tx: any → Prisma.TransactionClient
- Fixed 4 real bugs uncovered by typing:
  - mentor-workspace.ts: wrong FK fields (mentorAssignmentId → workspaceId, role → senderRole)
  - ai-shortlist.ts: untyped string passed to CompetitionCategory enum filter
  - result-lock.ts: unknown passed where Prisma.InputJsonValue required

#9 — Split assignment.ts (2,775 lines) into 6 focused files:
  - shared.ts (93 lines) — MOVABLE_EVAL_STATUSES, buildBatchNotifications, getCandidateJurors
  - assignment-crud.ts (473 lines) — 8 core CRUD procedures
  - assignment-suggestions.ts (880 lines) — AI suggestions + job runner
  - assignment-notifications.ts (138 lines) — 2 notification procedures
  - assignment-redistribution.ts (1,162 lines) — 8 reassign/transfer procedures
  - index.ts (15 lines) — barrel export with router merge, zero frontend changes

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

src/server/routers/assignment/assignment-notifications.ts

@@ -0,0 +1,138 @@
+import { z } from 'zod'
+import { TRPCError } from '@trpc/server'
+import { router, adminProcedure } from '../../trpc'
+import { createBulkNotifications, NotificationTypes } from '../../services/in-app-notification'
+import { logAudit } from '@/server/utils/audit'
+
+export const assignmentNotificationsRouter = router({
+  /**
+   * Notify all jurors of their current assignments for a round (admin only).
+   * Sends in-app notifications (emails are handled by maybeSendEmail via createBulkNotifications).
+   */
+  notifyJurorsOfAssignments: adminProcedure
+    .input(z.object({ roundId: z.string() }))
+    .mutation(async ({ ctx, input }) => {
+      const round = await ctx.prisma.round.findUniqueOrThrow({
+        where: { id: input.roundId },
+        select: { name: true, windowCloseAt: true },
+      })
+
+      // Get all assignments grouped by user
+      const assignments = await ctx.prisma.assignment.findMany({
+        where: { roundId: input.roundId },
+        select: { userId: true },
+      })
+
+      if (assignments.length === 0) {
+        return { sent: 0, jurorCount: 0 }
+      }
+
+      // Count assignments per user
+      const userCounts: Record<string, number> = {}
+      for (const a of assignments) {
+        userCounts[a.userId] = (userCounts[a.userId] || 0) + 1
+      }
+
+      const deadline = round.windowCloseAt
+        ? new Date(round.windowCloseAt).toLocaleDateString('en-US', {
+            weekday: 'long',
+            year: 'numeric',
+            month: 'long',
+            day: 'numeric',
+          })
+        : undefined
+
+      // Create in-app notifications grouped by project count
+      const usersByProjectCount = new Map<number, string[]>()
+      for (const [userId, projectCount] of Object.entries(userCounts)) {
+        const existing = usersByProjectCount.get(projectCount) || []
+        existing.push(userId)
+        usersByProjectCount.set(projectCount, existing)
+      }
+
+      let totalSent = 0
+      for (const [projectCount, userIds] of usersByProjectCount) {
+        if (userIds.length === 0) continue
+        await createBulkNotifications({
+          userIds,
+          type: NotificationTypes.BATCH_ASSIGNED,
+          title: `${projectCount} Projects Assigned`,
+          message: `You have been assigned ${projectCount} project${projectCount > 1 ? 's' : ''} to evaluate for ${round.name || 'this round'}.`,
+          linkUrl: `/jury/competitions`,
+          linkLabel: 'View Assignments',
+          metadata: { projectCount, roundName: round.name, deadline },
+        })
+        totalSent += userIds.length
+      }
+
+      await logAudit({
+        prisma: ctx.prisma,
+        userId: ctx.user.id,
+        action: 'NOTIFY_JURORS_OF_ASSIGNMENTS',
+        entityType: 'Round',
+        entityId: input.roundId,
+        detailsJson: {
+          jurorCount: Object.keys(userCounts).length,
+          totalAssignments: assignments.length,
+        },
+        ipAddress: ctx.ip,
+        userAgent: ctx.userAgent,
+      })
+
+      return { sent: totalSent, jurorCount: Object.keys(userCounts).length }
+    }),
+
+  notifySingleJurorOfAssignments: adminProcedure
+    .input(z.object({ roundId: z.string(), userId: z.string() }))
+    .mutation(async ({ ctx, input }) => {
+      const round = await ctx.prisma.round.findUniqueOrThrow({
+        where: { id: input.roundId },
+        select: { name: true, windowCloseAt: true },
+      })
+
+      const assignments = await ctx.prisma.assignment.findMany({
+        where: { roundId: input.roundId, userId: input.userId },
+        select: { id: true },
+      })
+
+      if (assignments.length === 0) {
+        throw new TRPCError({ code: 'NOT_FOUND', message: 'No assignments found for this juror in this round' })
+      }
+
+      const projectCount = assignments.length
+      const deadline = round.windowCloseAt
+        ? new Date(round.windowCloseAt).toLocaleDateString('en-US', {
+            weekday: 'long',
+            year: 'numeric',
+            month: 'long',
+            day: 'numeric',
+          })
+        : undefined
+
+      await createBulkNotifications({
+        userIds: [input.userId],
+        type: NotificationTypes.BATCH_ASSIGNED,
+        title: `${projectCount} Projects Assigned`,
+        message: `You have been assigned ${projectCount} project${projectCount > 1 ? 's' : ''} to evaluate for ${round.name || 'this round'}.`,
+        linkUrl: `/jury/competitions`,
+        linkLabel: 'View Assignments',
+        metadata: { projectCount, roundName: round.name, deadline },
+      })
+
+      await logAudit({
+        prisma: ctx.prisma,
+        userId: ctx.user.id,
+        action: 'NOTIFY_SINGLE_JUROR_OF_ASSIGNMENTS',
+        entityType: 'Round',
+        entityId: input.roundId,
+        detailsJson: {
+          targetUserId: input.userId,
+          assignmentCount: projectCount,
+        },
+        ipAddress: ctx.ip,
+        userAgent: ctx.userAgent,
+      })
+
+      return { sent: 1, projectCount }
+    }),
+})