Comprehensive admin UI stats audit: fix 16 display bugs

HIGH fixes:
- H1: Competition detail project count no longer double-counts across rounds
- H2: Rounds page header stats use unfiltered round set
- H3: Rounds page "eval" label corrected to "asgn" (assignment count)
- H4: Observer reports project count uses distinct analytics count
- H5: Awards eligibility count filters to only eligible=true (backend)
- H6: Round detail projectCount derived from projectStates for consistency
- H7: Deliberation hasVoted derived from votes array (was always undefined)

MEDIUM fixes:
- M1: Reports page round status badges use correct ROUND_ACTIVE/ROUND_CLOSED enums
- M2: Observer reports badges use ROUND_ prefix instead of stale STAGE_ prefix
- M3: Deliberation list status badges use correct VOTING/TALLYING/RUNOFF enums
- M4: Competition list/detail round count excludes special-award rounds (backend)
- M5: Messages page shows actual recipient count instead of hardcoded "1 user"

LOW fixes:
- L2: Observer analytics jurorCount scoped to round when roundId provided
- L3: Analytics round-scoped project count uses ProjectRoundState not assignments
- L4: JuryGroup delete audit log reports member count (not assignment count)
- L5: Project rankings include unevaluated projects at bottom instead of hiding

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

src/app/(admin)/admin/rounds/page.tsx

@@ -284,7 +284,8 @@ export default function RoundsPage() {
 
   const activeFilter = filterType !== 'all'
   const totalProjects = (compDetail as any)?.distinctProjectCount ?? 0
-  const totalAssignments = rounds.reduce((s, r) => s + r._count.assignments, 0)
+  const allRounds = (compDetail?.rounds ?? []) as RoundWithStats[]
+  const totalAssignments = allRounds.reduce((s, r) => s + r._count.assignments, 0)
   const activeRound = rounds.find((r) => r.status === 'ROUND_ACTIVE')
 
   return (
@@ -326,7 +327,7 @@ export default function RoundsPage() {
               </Tooltip>
             </div>
             <div className="flex items-center gap-4 mt-1 text-sm text-muted-foreground">
-              <span>{rounds.length} rounds</span>
+              <span>{allRounds.length} rounds</span>
               <span className="text-muted-foreground/30">|</span>
               <span>{totalProjects} projects</span>
               <span className="text-muted-foreground/30">|</span>
@@ -493,7 +494,7 @@ export default function RoundsPage() {
                                 {projectCount}
                               </span>
                               {assignmentCount > 0 && (
-                                <span className="tabular-nums">{assignmentCount} eval</span>
+                                <span className="tabular-nums">{assignmentCount} asgn</span>
                               )}
                               {(round.windowOpenAt || round.windowCloseAt) && (
                                 <span className="flex items-center gap-1 tabular-nums">