Simplify routing to award assignment, seed all CSV entries, fix category mapping

- Remove RoutingRule model and routing engine (replaced by direct award assignment)
- Simplify RoutingMode enum: PARALLEL/POST_MAIN → SHARED, keep EXCLUSIVE
- Remove routing router, routing-rules-editor, and related tests
- Update pipeline, award, and notification code to remove routing references
- Seed: include all CSV entries (no filtering/dedup), AI screening handles duplicates
- Seed: fix non-breaking space (U+00A0) bug in category/issue mapping
- Stage filtering: add duplicate detection that flags projects for admin review

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

src/app/(admin)/admin/rounds/pipeline/[id]/page.tsx

@@ -41,7 +41,6 @@ import { usePipelineInlineEdit } from '@/hooks/use-pipeline-inline-edit'
 import { MainTrackSection } from '@/components/admin/pipeline/sections/main-track-section'
 import { AwardsSection } from '@/components/admin/pipeline/sections/awards-section'
 import { NotificationsSection } from '@/components/admin/pipeline/sections/notifications-section'
-import { RoutingRulesEditor } from '@/components/admin/pipeline/routing-rules-editor'
 import { AwardGovernanceEditor } from '@/components/admin/pipeline/award-governance-editor'
 import { defaultNotificationConfig } from '@/lib/pipeline-defaults'
 import { toWizardTrackConfig } from '@/lib/pipeline-conversions'
@@ -601,16 +600,6 @@ export default function PipelineDetailPage() {
         </Card>
       </div>
 
-      {/* Routing Rules (only if multiple tracks) */}
-      {hasMultipleTracks && (
-        <div>
-          <RoutingRulesEditor
-            pipelineId={pipelineId}
-            tracks={trackOptionsForEditors}
-          />
-        </div>
-      )}
-
       {/* Award Governance (only if award tracks exist) */}
       {hasAwardTracks && (
         <div>

src/app/(admin)/admin/rounds/pipeline/[id]/wizard/page.tsx

@@ -58,7 +58,7 @@ export default function EditPipelineWizardPage() {
             slug: track.slug,
             kind: track.kind as 'MAIN' | 'AWARD' | 'SHOWCASE',
             sortOrder: track.sortOrder,
-            routingMode: track.routingMode as 'PARALLEL' | 'EXCLUSIVE' | 'POST_MAIN' | null,
+            routingMode: track.routingMode as 'SHARED' | 'EXCLUSIVE' | null,
             decisionMode: track.decisionMode as 'JURY_VOTE' | 'AWARD_MASTER_DECISION' | 'ADMIN_DECISION' | null,
             stages: track.stages.map(s => ({
               id: s.id,