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>

prisma/schema.prisma

@@ -163,9 +163,8 @@ enum TrackKind {
 }
 
 enum RoutingMode {
-  PARALLEL
+  SHARED
   EXCLUSIVE
-  POST_MAIN
 }
 
 enum StageStatus {
@@ -1846,7 +1845,6 @@ model Pipeline {
   // Relations
   program      Program       @relation(fields: [programId], references: [id], onDelete: Cascade)
   tracks       Track[]
-  routingRules RoutingRule[]
 
   @@index([programId])
   @@index([status])
@@ -1871,8 +1869,6 @@ model Track {
   stages                    Stage[]
   projectStageStates        ProjectStageState[]
   specialAward              SpecialAward?
-  routingRulesAsSource      RoutingRule[]       @relation("RoutingSourceTrack")
-  routingRulesAsDestination RoutingRule[]       @relation("RoutingDestinationTrack")
 
   @@unique([pipelineId, slug])
   @@unique([pipelineId, sortOrder])
@@ -1969,30 +1965,6 @@ model ProjectStageState {
   @@index([projectId, trackId])
 }
 
-model RoutingRule {
-  id                 String  @id @default(cuid())
-  pipelineId         String
-  name               String
-  scope              String  @default("global") // global, track, stage
-  sourceTrackId      String?
-  destinationTrackId String
-  destinationStageId String?
-  predicateJson      Json    @db.JsonB // { field, operator, value } or compound
-  priority           Int     @default(0)
-  isActive           Boolean @default(true)
-
-  createdAt DateTime @default(now())
-  updatedAt DateTime @updatedAt
-
-  // Relations
-  pipeline         Pipeline @relation(fields: [pipelineId], references: [id], onDelete: Cascade)
-  sourceTrack      Track?   @relation("RoutingSourceTrack", fields: [sourceTrackId], references: [id], onDelete: SetNull)
-  destinationTrack Track    @relation("RoutingDestinationTrack", fields: [destinationTrackId], references: [id], onDelete: Cascade)
-
-  @@index([pipelineId])
-  @@index([priority])
-  @@index([isActive])
-}
 
 model Cohort {
   id            String    @id @default(cuid())