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>

lib/db/index.ts

@@ -3,27 +3,52 @@ import { Pool } from 'pg'
 import { drizzle } from 'drizzle-orm/node-postgres'
 import * as schema from './schema'
 
-if (!process.env.DATABASE_URL) {
-  throw new Error('DATABASE_URL not configured')
-}
-if (!process.env.DATABASE_URL_ADMIN) {
-  throw new Error('DATABASE_URL_ADMIN not configured')
+function getDb() {
+  if (!process.env.DATABASE_URL) {
+    throw new Error('DATABASE_URL not configured')
+  }
+  if (!process.env.DATABASE_URL_ADMIN) {
+    throw new Error('DATABASE_URL_ADMIN not configured')
+  }
+
+  // app_user pool: RLS enforced. Used for all normal user operations.
+  const userPool = new Pool({
+    connectionString: process.env.DATABASE_URL,
+    max: 10,
+  })
+
+  // app_admin pool: BYPASSRLS. Used for admin user CRUD and service operations.
+  const adminPool = new Pool({
+    connectionString: process.env.DATABASE_URL_ADMIN,
+    max: 5,
+  })
+
+  return {
+    userDb: drizzle(userPool, { schema }),
+    adminDb: drizzle(adminPool, { schema }),
+  }
 }
 
-// app_user pool: RLS enforced. Used for all normal user operations.
-const userPool = new Pool({
-  connectionString: process.env.DATABASE_URL,
-  max: 10,
+// Lazy singleton — pools are created on first access, not at module load time.
+// This prevents Next.js build from throwing during static analysis when env vars
+// are not present in the build environment.
+let _dbs: ReturnType<typeof getDb> | null = null
+function dbs() {
+  if (!_dbs) _dbs = getDb()
+  return _dbs
+}
+
+export const userDb = new Proxy({} as ReturnType<typeof getDb>['userDb'], {
+  get(_target, prop) {
+    return (dbs().userDb as unknown as Record<string | symbol, unknown>)[prop]
+  },
 })
 
-// app_admin pool: BYPASSRLS. Used for admin user CRUD and service operations.
-const adminPool = new Pool({
-  connectionString: process.env.DATABASE_URL_ADMIN,
-  max: 5,
+export const adminDb = new Proxy({} as ReturnType<typeof getDb>['adminDb'], {
+  get(_target, prop) {
+    return (dbs().adminDb as unknown as Record<string | symbol, unknown>)[prop]
+  },
 })
 
-export const userDb = drizzle(userPool, { schema })
-export const adminDb = drizzle(adminPool, { schema })
-
-export type UserDb = typeof userDb
-export type AdminDb = typeof adminDb
+export type UserDb = ReturnType<typeof getDb>['userDb']
+export type AdminDb = ReturnType<typeof getDb>['adminDb']