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)/layout.tsx

@@ -1,7 +1,7 @@
 export const dynamic = 'force-dynamic'
 
-import { createClient } from '@/lib/supabase/server'
 import { redirect } from 'next/navigation'
+import { getSession } from '@/lib/auth/get-session'
 import { Sidebar } from '@/components/layout/sidebar'
 
 export default async function ProtectedLayout({
@@ -9,25 +9,15 @@ export default async function ProtectedLayout({
 }: {
   children: React.ReactNode
 }) {
-  const supabase = await createClient()
-  const {
-    data: { user },
-  } = await supabase.auth.getUser()
-
-  if (!user) redirect('/login')
-
-  const { data: profile } = await supabase
-    .from('users')
-    .select('role, name, email')
-    .eq('id', user.id)
-    .single()
+  const session = await getSession()
+  if (!session) redirect('/login')
 
   return (
     <div className="min-h-screen bg-gray-50">
       <Sidebar
-        role={profile?.role ?? 'reporter'}
-        userName={profile?.name ?? user.email ?? ''}
-        userEmail={profile?.email ?? user.email ?? ''}
+        role={session.role}
+        userName={session.name}
+        userEmail=""
       />
       <div className="sm:ml-60 pb-16 sm:pb-0">
         {children}