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/schema.ts

@@ -232,3 +232,14 @@ export const incidentAddenda = pgTable('incident_addenda', {
   body:       text('body').notNull(),
   createdAt:  timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),
 })
+
+// password_reset_tokens: added in Phase 3 for custom auth
+// accessed via app_admin only (BYPASSRLS); no user-facing policies needed
+export const passwordResetTokens = pgTable('password_reset_tokens', {
+  id:        uuid('id').primaryKey().defaultRandom(),
+  userId:    uuid('user_id').notNull().references(() => users.id, { onDelete: 'cascade' }),
+  tokenHash: text('token_hash').notNull().unique(),
+  expiresAt: timestamp('expires_at', { withTimezone: true }).notNull(),
+  usedAt:    timestamp('used_at', { withTimezone: true }),
+  createdAt: timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),
+})