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/integrity-checks.ts

@@ -124,26 +124,7 @@ async function runChecks(): Promise<CheckResult[]> {
       : `${emptyPipelineCount} empty pipelines, ${emptyTrackCount} empty tracks`,
   })
 
-  // 8. RoutingRule destinations reference valid tracks in same pipeline
-  const badRoutingRules = await prisma.$queryRaw<{ count: bigint }[]>`
-    SELECT COUNT(*) as count FROM "RoutingRule" rr
-    WHERE rr."destinationTrackId" IS NOT NULL
-      AND NOT EXISTS (
-        SELECT 1 FROM "Track" t
-        WHERE t.id = rr."destinationTrackId"
-          AND t."pipelineId" = rr."pipelineId"
-      )
-  `
-  const badRouteCount = Number(badRoutingRules[0]?.count ?? 0)
-  results.push({
-    name: 'RoutingRule destinations reference valid tracks in same pipeline',
-    passed: badRouteCount === 0,
-    details: badRouteCount === 0
-      ? 'All routing rules reference valid destination tracks'
-      : `Found ${badRouteCount} routing rules with invalid destinations`,
-  })
-
-  // 9. LiveProgressCursor references valid stage
+  // 8. LiveProgressCursor references valid stage
   const badCursors = await prisma.$queryRaw<{ count: bigint }[]>`
     SELECT COUNT(*) as count FROM "LiveProgressCursor" lpc
     WHERE NOT EXISTS (SELECT 1 FROM "Stage" s WHERE s.id = lpc."stageId")