security: comprehensive security audit and remediation (20 fixes)

CRITICAL fixes:
- Restrict X-View-Tenant impersonation to global admin only (was any admin)
- Add authorization to subscription endpoints (was open to any user)
- Make webhook signature verification mandatory (was skippable)
- Remove databaseName from JWT payload (resolve server-side with cache)
- Reduce body size limit from 1GB to 10MB (50MB for bulk CFDI)
- Restrict .env file permissions to 600

HIGH fixes:
- Add authorization to SAT cron endpoints (global admin only)
- Add Content-Security-Policy and Permissions-Policy headers
- Centralize isGlobalAdmin() utility with caching
- Add rate limiting on auth endpoints (express-rate-limit)
- Require authentication on logout endpoint

MEDIUM fixes:
- Replace Math.random() with crypto.randomBytes for temp passwords
- Remove console.log of temporary passwords in production
- Remove DB credentials from admin notification email
- Add escapeHtml() to email templates (prevent HTML injection)
- Add file size validation on FIEL upload (50KB max)
- Require TLS for SMTP connections
- Normalize email to lowercase before uniqueness check
- Remove hardcoded default for FIEL_ENCRYPTION_KEY

Also includes:
- Complete production deployment documentation
- API reference documentation
- Security audit report with remediation details
- Updated README with v0.5.0 changelog
- New client admin email template
- Utility scripts (create-carlos, test-emails)
- PM2 ecosystem config updates

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/api/src/controllers/sat.controller.ts

@@ -7,6 +7,7 @@ import {
 } from '../services/sat/sat.service.js';
 import { getJobInfo, runSatSyncJobManually } from '../jobs/sat-sync.job.js';
 import type { StartSyncRequest } from '@horux/shared';
+import { isGlobalAdmin } from '../utils/global-admin.js';
 
 /**
  * Inicia una sincronización manual
@@ -121,10 +122,14 @@ export async function retry(req: Request, res: Response): Promise<void> {
 }
 
 /**
- * Obtiene información del job programado (solo admin)
+ * Obtiene información del job programado (solo admin global)
  */
 export async function cronInfo(req: Request, res: Response): Promise<void> {
   try {
+    if (!(await isGlobalAdmin(req.user!.tenantId, req.user!.role))) {
+      res.status(403).json({ error: 'Solo el administrador global puede ver info del cron' });
+      return;
+    }
     const info = getJobInfo();
     res.json(info);
   } catch (error: any) {
@@ -134,10 +139,14 @@ export async function cronInfo(req: Request, res: Response): Promise<void> {
 }
 
 /**
- * Ejecuta el job de sincronización manualmente (solo admin)
+ * Ejecuta el job de sincronización manualmente (solo admin global)
  */
 export async function runCron(req: Request, res: Response): Promise<void> {
   try {
+    if (!(await isGlobalAdmin(req.user!.tenantId, req.user!.role))) {
+      res.status(403).json({ error: 'Solo el administrador global puede ejecutar el cron' });
+      return;
+    }
     // Ejecutar en background
     runSatSyncJobManually().catch(err =>
       console.error('[SAT Controller] Error ejecutando cron manual:', err)