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/server/routers/award.ts

@@ -14,7 +14,7 @@ export const awardRouter = router({
         pipelineId: z.string(),
         name: z.string().min(1).max(255),
         slug: z.string().min(1).max(100).regex(/^[a-z0-9-]+$/),
-        routingMode: z.enum(['PARALLEL', 'EXCLUSIVE', 'POST_MAIN']).optional(),
+        routingMode: z.enum(['SHARED', 'EXCLUSIVE']).optional(),
         decisionMode: z.enum(['JURY_VOTE', 'AWARD_MASTER_DECISION', 'ADMIN_DECISION']).optional(),
         settingsJson: z.record(z.unknown()).optional(),
         awardConfig: z.object({