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)/hse/page.tsx

@@ -1,20 +1,17 @@
 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'
 
 export default async function HsePage() {
-  const supabase = await createClient()
-  const { data: { user } } = await supabase.auth.getUser()
-  if (!user) redirect('/login')
-
-  const { data: profile } = await supabase.from('users').select('name').eq('id', user.id).single()
+  const session = await getSession()
+  if (!session) redirect('/login')
 
   return (
     <main className="max-w-4xl mx-auto px-4 py-6">
       <h1 className="text-2xl font-bold text-gray-900 mb-1">HSE Officer Portal</h1>
-      <p className="text-gray-500 text-sm mb-8">Welcome, {profile?.name ?? user.email}</p>
+      <p className="text-gray-500 text-sm mb-8">Welcome, {session.name}</p>
       <div className="grid grid-cols-2 gap-4 sm:grid-cols-3">
         <Link href="/hse/incidents" className="bg-white rounded-xl shadow-sm p-5 hover:shadow-md transition-shadow border border-gray-100">
           <div className="text-2xl mb-2">📋</div>