feat(auth): phase 3 — replace Supabase GoTrue with bcryptjs+jose

Custom auth stack: bcryptjs password hashing (cost 10, GoTrue-compatible),
jose JWT session cookies (edge-safe, 8hr TTL), new API routes for
login/logout/reset/change-password, middleware rewritten to JWT-only
verification with no DB access. All 38 protected pages and API routes
migrated from supabase.auth.getUser() to getSession(). Supabase .from()
queries retained for Phase 4. lib/db/index.ts refactored to lazy Proxy
singleton to avoid module-level throw during Next.js build.

tsc: clean, build: clean, tests: 4/4 passed

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

app/(protected)/reporter/incidents/[id]/page.tsx

@@ -3,6 +3,7 @@ export const dynamic = 'force-dynamic'
 import Link from 'next/link'
 import { createClient } from '@/lib/supabase/server'
 import { redirect, notFound } from 'next/navigation'
+import { getSession } from '@/lib/auth/get-session'
 
 const STATUS_LABELS: Record<string, string> = {
   reported: 'Reported', triaged: 'Triaged', investigating: 'Investigating',
@@ -20,9 +21,10 @@ export default async function ReporterIncidentDetail({
   params: Promise<{ id: string }>
 }) {
   const { id } = await params
+  const session = await getSession()
+  if (!session) redirect('/login')
+
   const supabase = await createClient()
-  const { data: { user } } = await supabase.auth.getUser()
-  if (!user) redirect('/login')
 
   const { data: inc } = await supabase
     .from('incidents')
@@ -33,7 +35,7 @@ export default async function ReporterIncidentDetail({
       capa_actions (id, description, status, due_date)
     `)
     .eq('id', id)
-    .eq('reported_by', user.id)
+    .eq('reported_by', session.sub)
     .single()
 
   if (!inc) notFound()

app/(protected)/reporter/page.tsx

@@ -3,6 +3,7 @@ export const dynamic = 'force-dynamic'
 import Link from 'next/link'
 import { createClient } from '@/lib/supabase/server'
 import { redirect } from 'next/navigation'
+import { getSession } from '@/lib/auth/get-session'
 
 const STATUS_LABELS: Record<string, string> = {
   reported: 'Reported',
@@ -28,16 +29,15 @@ const TYPE_LABELS: Record<string, string> = {
 }
 
 export default async function ReporterPage() {
-  const supabase = await createClient()
-  const { data: { user } } = await supabase.auth.getUser()
-  if (!user) redirect('/login')
+  const session = await getSession()
+  if (!session) redirect('/login')
 
-  const { data: profile } = await supabase.from('users').select('name').eq('id', user.id).single()
+  const supabase = await createClient()
 
   const { data: incidents } = await supabase
     .from('incidents')
     .select('id, reference_no, incident_type, status, reported_at, severity, sites (name)')
-    .eq('reported_by', user.id)
+    .eq('reported_by', session.sub)
     .order('reported_at', { ascending: false })
 
   const rows = incidents ?? []
@@ -49,7 +49,7 @@ export default async function ReporterPage() {
       <div className="flex items-center justify-between mb-6">
         <div>
           <h1 className="text-2xl font-bold text-gray-900">My Reports</h1>
-          <p className="text-sm text-gray-400 mt-0.5">Welcome, {profile?.name ?? user.email}</p>
+          <p className="text-sm text-gray-400 mt-0.5">Welcome, {session.name}</p>
         </div>
         <Link
           href="/report"