fix: security hardening + performance refactoring (code review batch 1)

- IDOR fix: deliberation vote now verifies juryMemberId === ctx.user.id
- Rate limiting: tRPC middleware (100/min), AI endpoints (5/hr), auth IP-based (10/15min)
- 6 compound indexes added to Prisma schema
- N+1 eliminated in processRoundClose (batch updateMany/createMany)
- N+1 eliminated in batchCheckRequirementsAndTransition (3 batch queries)
- Service extraction: juror-reassignment.ts (578 lines)
- Dead code removed: award.ts, cohort.ts, decision.ts (680 lines)
- 35 bare catch blocks replaced across 16 files
- Fire-and-forget async calls fixed
- Notification false positive bug fixed

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

src/server/routers/learningResource.ts

@@ -40,7 +40,8 @@ async function canUserAccessResource(
     const parsed = accessJson as unknown[]
     if (!Array.isArray(parsed) || parsed.length === 0) return true
     rules = parsed as AccessRule[]
-  } catch {
+  } catch (err) {
+    console.error('Failed to parse learning resource access rules JSON:', err)
     return true
   }