security: implement 6 high-severity vulnerability fixes

HIGH-SEVERITY FIXES (Fase 2):

1. Rate Limiting (Vulnerabilidade 2.1)
   - express-rate-limit: 100 req/15min (prod), 1000 req/15min (dev)
   - Applied to all /api/* routes
   - Standard headers for retry-after

2. CORS Restrictions (Vulnerabilidade 2.2)
   - Whitelist: dashboard.descomplicar.pt, desk.descomplicar.pt
   - Localhost only in development
   - CORS blocking logs

3. Input Validation with Zod (Vulnerabilidade 2.4)
   - Generic validateRequest() middleware
   - Schemas: WordPress Monitor, server metrics, dashboard, financial
   - Applied to api/routes/wp-monitor.ts POST endpoint
   - Detailed field-level error messages

4. Backend Authentication OIDC (Vulnerabilidade 2.5 - OPTIONAL)
   - Enabled via OIDC_ENABLED=true
   - Bearer token validation on all APIs
   - Backward compatible (disabled by default)

5. SSH Key-Based Auth Migration (Vulnerabilidade 2.6)
   - Script: /media/ealmeida/Dados/Dev/ClaudeDev/migrate-ssh-keys.sh
   - Generates ed25519 key, copies to 6 servers
   - Instructions to remove passwords from .env
   - .env.example updated with SSH_PRIVATE_KEY_PATH

6. Improved Error Handling (Vulnerabilidade 2.5)
   - Unique error IDs (UUID) for tracking
   - Structured JSON logs in production
   - Stack traces blocked in production
   - Generic messages to client

FILES CHANGED:
- api/server.ts - Complete refactor with all security improvements
- api/middleware/validation.ts - NEW: Zod middleware and schemas
- api/routes/wp-monitor.ts - Added Zod validation on POST
- .env.example - Complete security documentation
- CHANGELOG.md - Full documentation of 9 fixes (3 critical + 6 high)
- package.json + package-lock.json - New dependencies

DEPENDENCIES ADDED:
- express-rate-limit@7.x
- zod@3.x
- express-openid-connect@2.x

AUDIT STATUS:
- npm audit: 0 vulnerabilities
- Hook Regra #47: PASSED

PROGRESS:
- Phase 1 (Critical): 3/3 ✅ COMPLETE
- Phase 2 (High): 6/6 ✅ COMPLETE
- Phase 3 (Medium): 0/6 - Next
- Phase 4 (Low): 0/5 - Next

Related: AUDIT-REPORT.md vulnerabilities 2.1, 2.2, 2.4, 2.5, 2.6

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

api/routes/wp-monitor.ts

@@ -9,6 +9,7 @@
 import { Router } from 'express'
 import type { Request, Response } from 'express'
 import db from '../db.js'
+import { validateRequest, wpMonitorSchema } from '../middleware/validation.js'
 
 const router = Router()
 
@@ -64,13 +65,9 @@ router.get('/', validateApiKey, async (req: Request, res: Response) => {
 })
 
 // Receive data from WordPress plugin
-router.post('/', validateApiKey, async (req: Request, res: Response) => {
+router.post('/', validateApiKey, validateRequest(wpMonitorSchema), async (req: Request, res: Response) => {
   const data = req.body
 
-  if (!data || !data.site_url) {
-    return res.status(400).json({ error: 'Bad Request', message: 'Invalid JSON or missing site_url' })
-  }
-
   try {
     const siteUrl = data.site_url.replace(/\/$/, '')
     const siteName = data.site_name || new URL(siteUrl).hostname