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/api/capa/[id]/route.ts

@@ -3,15 +3,17 @@ export const dynamic = 'force-dynamic'
 import { NextRequest, NextResponse } from 'next/server'
 import { createClient } from '@/lib/supabase/server'
 import { createAdminClient } from '@/lib/supabase/admin'
+import { getSession } from '@/lib/auth/get-session'
 
 export async function GET(
   _: NextRequest,
   { params }: { params: Promise<{ id: string }> }
 ) {
   const { id } = await params
+  const session = await getSession()
+  if (!session) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+
   const supabase = await createClient()
-  const { data: { user }, error: authError } = await supabase.auth.getUser()
-  if (authError || !user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
 
   const { data, error } = await supabase
     .from('capa_actions')
@@ -27,9 +29,8 @@ export async function GET(
 
   if (error || !data) return NextResponse.json({ error: 'Not found' }, { status: 404 })
 
-  const { data: profile } = await supabase.from('users').select('role').eq('id', user.id).single()
-  const role = profile?.role ?? ''
-  const isOwner = data.owner_user_id === user.id
+  const role = session.role
+  const isOwner = data.owner_user_id === session.sub
   const canRead = ['hse', 'admin', 'supervisor'].includes(role) || isOwner
   if (!canRead) return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
 
@@ -46,15 +47,14 @@ export async function PATCH(
   { params }: { params: Promise<{ id: string }> }
 ) {
   const { id } = await params
-  const supabase = await createClient()
-  const { data: { user }, error: authError } = await supabase.auth.getUser()
-  if (authError || !user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  const session = await getSession()
+  if (!session) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
 
-  const { data: profile } = await supabase.from('users').select('role').eq('id', user.id).single()
-  const role = profile?.role ?? ''
+  const supabase = await createClient()
+  const role = session.role
 
   const { data: capa } = await supabase.from('capa_actions').select('owner_user_id, status').eq('id', id).single()
-  const isOwner = capa?.owner_user_id === user.id
+  const isOwner = capa?.owner_user_id === session.sub
   const canEdit = ['hse', 'admin'].includes(role) || isOwner
   if (!canEdit) return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
 

app/api/capa/[id]/verify/route.ts

@@ -2,6 +2,7 @@ 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 { createInAppNotifications } from '@/lib/notifications/in-app'
 
 export async function POST(
@@ -9,16 +10,13 @@ export async function POST(
   { params }: { params: Promise<{ id: string }> }
 ) {
   const { id } = await params
-  const supabase = await createClient()
-
-  const { data: { user }, error: authError } = await supabase.auth.getUser()
-  if (authError || !user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
-
-  const { data: profile } = await supabase
-    .from('users').select('role').eq('id', user.id).single()
-  if (!profile || !['hse', 'admin'].includes(profile.role))
+  const session = await getSession()
+  if (!session) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  if (!['hse', 'admin'].includes(session.role))
     return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
 
+  const supabase = await createClient()
+
   const { data: capa } = await supabase
     .from('capa_actions').select('status, incident_id, owner_user_id').eq('id', id).single()
   if (!capa) return NextResponse.json({ error: 'Not found' }, { status: 404 })
@@ -35,7 +33,7 @@ export async function POST(
 
   const update: Record<string, unknown> = {
     status: body.verdict,
-    verified_by: user.id,
+    verified_by: session.sub,
     verified_at: verifiedAt.toISOString(),
     ...(body.verdict === 'verified'
       ? {

app/api/capa/route.ts

@@ -2,16 +2,14 @@ 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 { createInAppNotifications } from '@/lib/notifications/in-app'
 
 export async function GET() {
-  const supabase = await createClient()
-  const { data: { user }, error: authError } = await supabase.auth.getUser()
-  if (authError || !user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  const session = await getSession()
+  if (!session) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
 
-  const { data: profile } = await supabase
-    .from('users').select('role').eq('id', user.id).single()
-  if (!profile) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  const supabase = await createClient()
 
   let query = supabase
     .from('capa_actions')
@@ -23,8 +21,8 @@ export async function GET() {
     `)
     .order('due_date', { ascending: true })
 
-  if (profile.role === 'supervisor' || profile.role === 'worker') {
-    query = query.eq('owner_user_id', user.id)
+  if (session.role === 'supervisor' || session.role === 'worker') {
+    query = query.eq('owner_user_id', session.sub)
   }
 
   const { data, error } = await query
@@ -33,15 +31,13 @@ export async function GET() {
 }
 
 export async function POST(request: NextRequest) {
-  const supabase = await createClient()
-  const { data: { user }, error: authError } = await supabase.auth.getUser()
-  if (authError || !user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
-
-  const { data: profile } = await supabase
-    .from('users').select('role').eq('id', user.id).single()
-  if (!profile || !['hse', 'admin'].includes(profile.role))
+  const session = await getSession()
+  if (!session) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  if (!['hse', 'admin'].includes(session.role))
     return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
 
+  const supabase = await createClient()
+
   const body = await request.json()
   const { incident_id, description, owner_user_id, department, due_date, priority, root_cause_ref } = body