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/[id]/triage/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 } from '@/lib/db/with-user'
+import { writeAuditLog } from '@/lib/db/audit'
+import { incidents } from '@/lib/db/schema'
+import { eq } from 'drizzle-orm'
 
 interface TriageBody {
   severity: number
@@ -23,40 +26,33 @@ export async function PATCH(
   if (!['hse', 'admin'].includes(session.role))
     return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
 
-  const supabase = await createClient()
-
   const body: TriageBody = await request.json()
   if (body.severity < 1 || body.severity > 5)
     return NextResponse.json({ error: 'severity must be 1–5' }, { status: 422 })
 
-  const { data: incident } = await supabase
-    .from('incidents').select('status').eq('id', id).single()
+  const [incident] = await withUser(session.sub, async tx =>
+    tx.select({ status: incidents.status }).from(incidents).where(eq(incidents.id, id)).limit(1)
+  )
   if (!incident) return NextResponse.json({ error: 'Not found' }, { status: 404 })
   if (incident.status !== 'reported')
     return NextResponse.json({ error: 'Incident is not in reported status' }, { status: 409 })
 
-  const { error } = await supabase
-    .from('incidents')
-    .update({
+  await withUser(session.sub, async tx => {
+    await tx.update(incidents).set({
       severity: body.severity,
-      is_fatality: body.is_fatality,
-      is_serious_bodily_injury: body.is_serious_bodily_injury,
-      is_dangerous_occurrence: body.is_dangerous_occurrence,
-      is_occupational_disease: body.is_occupational_disease,
-      triage_notes: body.triage_notes ?? null,
-      triaged_by: session.sub,
-      triaged_at: new Date().toISOString(),
+      isFatality: body.is_fatality,
+      isSeriousBodilyInjury: body.is_serious_bodily_injury,
+      isDangerousOccurrence: body.is_dangerous_occurrence,
+      isOccupationalDisease: body.is_occupational_disease,
+      triageNotes: body.triage_notes ?? null,
+      triagedBy: session.sub,
+      triagedAt: new Date(),
       status: 'triaged',
+    }).where(eq(incidents.id, id))
+
+    await writeAuditLog(tx, 'incidents', id, 'triage', {
+      severity: body.severity, status: 'triaged', triaged_by: session.sub,
     })
-    .eq('id', id)
-
-  if (error) return NextResponse.json({ error: 'Update failed' }, { status: 500 })
-
-  await supabase.rpc('write_audit_log', {
-    p_table_name: 'incidents',
-    p_record_id: id,
-    p_action: 'triage',
-    p_new_value: { severity: body.severity, status: 'triaged', triaged_by: session.sub },
   })
 
   return NextResponse.json({ ok: true })