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/migrations/20260214000000_simplify_routing_to_award_assignment/migration.sql

@@ -0,0 +1,28 @@
+-- Simplify RoutingMode enum: remove POST_MAIN, rename PARALLEL → SHARED
+-- Drop RoutingRule table (routing is now handled via award assignment)
+
+-- 1. Update existing PARALLEL values to SHARED, POST_MAIN to SHARED
+UPDATE "Track" SET "routingMode" = 'PARALLEL' WHERE "routingMode" = 'POST_MAIN';
+
+-- 2. Rename PARALLEL → SHARED in the enum
+ALTER TYPE "RoutingMode" RENAME VALUE 'PARALLEL' TO 'SHARED';
+
+-- 3. Remove POST_MAIN from the enum
+-- PostgreSQL doesn't support DROP VALUE directly, so we recreate the enum
+-- Since we already converted POST_MAIN values to PARALLEL (now SHARED), this is safe
+
+-- Create new enum without POST_MAIN
+-- Actually, since we already renamed PARALLEL to SHARED and converted POST_MAIN rows,
+-- we just need to remove the POST_MAIN value. PostgreSQL 13+ doesn't support dropping
+-- enum values natively, but since all rows are already migrated, we can:
+CREATE TYPE "RoutingMode_new" AS ENUM ('SHARED', 'EXCLUSIVE');
+
+ALTER TABLE "Track"
+  ALTER COLUMN "routingMode" TYPE "RoutingMode_new"
+  USING ("routingMode"::text::"RoutingMode_new");
+
+DROP TYPE "RoutingMode";
+ALTER TYPE "RoutingMode_new" RENAME TO "RoutingMode";
+
+-- 4. Drop the RoutingRule table (no longer needed)
+DROP TABLE IF EXISTS "RoutingRule";