feat(db): phase 4 group 3 — incident routes to Drizzle

Convert all 11 incident API routes from Supabase PostgREST to Drizzle
ORM with withUser/asAdmin/writeAuditLog patterns and RLS enforcement.
Only uploadEvidenceFile retains supabase client (Phase 5 storage work).

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

app/api/incidents/ai/quality-check/route.ts

@@ -1,8 +1,11 @@
 export const dynamic = 'force-dynamic'
 
 import { NextRequest, NextResponse } from 'next/server'
-import { createClient } from '@/lib/supabase/server'
 import { getSession } from '@/lib/auth/get-session'
+import { withUser, asAdmin } from '@/lib/db/with-user'
+import { writeAuditLog } from '@/lib/db/audit'
+import { auditLog } from '@/lib/db/schema'
+import { eq, and, gte, sql } from 'drizzle-orm'
 import { createDeepSeekClient } from '@/lib/claude/client'
 import { getApiKey } from '@/lib/settings'
 
@@ -10,16 +13,17 @@ export async function POST(request: NextRequest) {
   const session = await getSession()
   if (!session) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
 
-  const supabase = await createClient()
-
-  const since = new Date(Date.now() - 60_000).toISOString()
-  const { count: recentCount } = await supabase
-    .from('audit_log')
-    .select('id', { count: 'exact', head: true })
-    .eq('changed_by', session.sub)
-    .eq('action', 'ai_quality_check')
-    .gte('changed_at', since)
-  if ((recentCount ?? 0) > 0)
+  // Rate limit
+  const since = new Date(Date.now() - 60_000)
+  const [rateRow] = await asAdmin(db =>
+    db.select({ cnt: sql<number>`count(*)` }).from(auditLog)
+      .where(and(
+        eq(auditLog.changedBy, session.sub),
+        eq(auditLog.action, 'ai_quality_check'),
+        gte(auditLog.changedAt, since),
+      ))
+  )
+  if (Number(rateRow?.cnt ?? 0) > 0)
     return NextResponse.json({ error: 'Rate limited — please wait 60 seconds' }, { status: 429 })
 
   const deepseekKey = await getApiKey('DEEPSEEK_API_KEY')
@@ -92,11 +96,11 @@ Score 1–10 based on: specificity (location, time, persons involved), completen
     return NextResponse.json({ error: 'AI returned unexpected structure' }, { status: 500 })
   }
 
-  await supabase.rpc('write_audit_log', {
-    p_table_name: 'incidents',
-    p_record_id: session.sub,
-    p_action: 'ai_quality_check',
-    p_new_value: { score: input.score, passes: input.passes, model: 'deepseek-chat' } as never,
+  // audit write uses session.sub as a pseudo record-id (no incident_id at this stage)
+  await withUser(session.sub, async tx => {
+    await writeAuditLog(tx, 'incidents', session.sub, 'ai_quality_check', {
+      score: input.score, passes: input.passes, model: 'deepseek-chat',
+    })
   })
 
   return NextResponse.json(input)