feat: rate limiting + internal health monitor + secure VAPID note

Rate limiting:
- Shop POST endpoints get per-IP throttles with distinct prefixes so login,
  register, password-email, and password-reset have separate buckets:
  login/register/pw-reset = 5/min, pw-email = 3/min
- OcrInvoiceService gates per-tenant via RateLimiter (30/hour) so a runaway
  uploader can't burn Claude Vision spend

Health monitor (poor-man's monitoring):
- HealthCheckCommand probes DB (SELECT 1), cache write/read, public storage
  write/read, and most-recent backup age. On any failure, pushes a Telegram
  alert via HEALTH_ALERT_BOT_TOKEN/HEALTH_ALERT_CHAT_ID. Dedups identical
  failures within a 30-min window via cache.
- Scheduled every 10 min. Pair with external uptime monitoring (UptimeRobot,
  Better Stack hitting /up) for total-outage coverage.
- .env.example documents the two new env vars.

VAPID secret hygiene:
- credentials.md no longer stores the VAPID_PRIVATE_KEY; the source of truth
  is the Coolify env on the autocrm app. Doc points to where to read it
  (UI or API). Mitigates accidental git leak.

Tests (4 new):
- shop login throttles after 5 attempts (6th = 429); register throttle is
  independent of login (separate prefix); health command runs clean; dedup
  cache path exercised

Full suite: 138 passed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/Console/Commands/HealthCheckCommand.php

@@ -0,0 +1,122 @@
+<?php
+
+namespace App\Console\Commands;
+
+use Illuminate\Console\Command;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Http;
+use Illuminate\Support\Facades\Log;
+use Illuminate\Support\Facades\Storage;
+
+/**
+ * Lightweight self-health probe. Runs on the box, so it can't catch total
+ * outages — pair with external uptime monitoring (UptimeRobot, Better Stack)
+ * pointing at /up.
+ *
+ * Tests:
+ *   - DB connectivity (central connection: SELECT 1)
+ *   - Cache write/read (Redis if configured)
+ *   - Public storage disk write/read
+ *   - Most recent tenant backup age (warn if > 30h)
+ *
+ * On any failure, pushes a short Telegram alert to HEALTH_ALERT_CHAT_ID via
+ * HEALTH_ALERT_BOT_TOKEN (env). Dedups identical failures within 30 minutes
+ * via cache to avoid spamming on each cron tick.
+ */
+class HealthCheckCommand extends Command
+{
+    protected $signature = 'health:check
+                            {--silent : Do not echo OK output (for cron)}';
+
+    protected $description = 'Probe DB / cache / storage / backup freshness; alert via Telegram on failure.';
+
+    public function handle(): int
+    {
+        $issues = [];
+
+        try {
+            DB::connection()->select('SELECT 1');
+        } catch (\Throwable $e) {
+            $issues[] = 'DB: ' . substr($e->getMessage(), 0, 120);
+        }
+
+        try {
+            $stamp = 'hc:' . (string) microtime(true);
+            Cache::put('health:probe', $stamp, 30);
+            if (Cache::get('health:probe') !== $stamp) {
+                $issues[] = 'Cache: write/read mismatch';
+            }
+        } catch (\Throwable $e) {
+            $issues[] = 'Cache: ' . substr($e->getMessage(), 0, 120);
+        }
+
+        try {
+            $f = 'health/' . md5((string) microtime(true)) . '.txt';
+            Storage::disk('public')->put($f, 'ok');
+            if (Storage::disk('public')->get($f) !== 'ok') {
+                $issues[] = 'Storage: write/read mismatch';
+            }
+            Storage::disk('public')->delete($f);
+        } catch (\Throwable $e) {
+            $issues[] = 'Storage: ' . substr($e->getMessage(), 0, 120);
+        }
+
+        try {
+            $newest = collect(Storage::disk('local')->allFiles('backups'))
+                ->map(fn ($f) => Storage::disk('local')->lastModified($f))
+                ->max();
+            if ($newest && (time() - $newest) > 30 * 3600) {
+                $age = round((time() - $newest) / 3600, 1);
+                $issues[] = "Backup: cel mai recent are {$age}h (expectat <30h).";
+            }
+        } catch (\Throwable $e) {
+            // Backup folder might be empty on a fresh install — not an alert.
+        }
+
+        if (empty($issues)) {
+            if (! $this->option('silent')) {
+                $this->info('Health OK · ' . now()->toIso8601String());
+            }
+            return self::SUCCESS;
+        }
+
+        $signature = md5(implode('|', $issues));
+        $dedupKey = "health:alert:{$signature}";
+        if (! Cache::has($dedupKey)) {
+            $this->pushTelegramAlert($issues);
+            Cache::put($dedupKey, 1, 30 * 60);   // 30-min cooldown per fingerprint
+        }
+
+        foreach ($issues as $i) $this->error($i);
+        return self::FAILURE;
+    }
+
+    private function pushTelegramAlert(array $issues): void
+    {
+        $bot = env('HEALTH_ALERT_BOT_TOKEN');
+        $chat = env('HEALTH_ALERT_CHAT_ID');
+        if (! $bot || ! $chat) {
+            Log::warning('health:check failed but HEALTH_ALERT_BOT_TOKEN/CHAT_ID not set', [
+                'issues' => $issues,
+            ]);
+            return;
+        }
+
+        $body = "🚨 <b>AutoCRM health alert</b>\n"
+            . implode("\n", array_map(fn ($i) => '• ' . htmlspecialchars($i), $issues))
+            . "\n\n" . config('app.url', 'service.mir.md');
+
+        try {
+            Http::asJson()
+                ->timeout(10)
+                ->post("https://api.telegram.org/bot{$bot}/sendMessage", [
+                    'chat_id' => $chat,
+                    'text' => $body,
+                    'parse_mode' => 'HTML',
+                ]);
+        } catch (\Throwable $e) {
+            Log::warning('health:check telegram alert failed', ['err' => $e->getMessage()]);
+        }
+    }
+}

app/Services/Ai/OcrInvoiceService.php

@@ -38,6 +38,15 @@ class OcrInvoiceService
             return ['ok' => false, 'error' => 'Tenant nerezolvat.'];
         }
 
+        // Per-tenant rate limit — caps Claude Vision spend even if a user
+        // accidentally (or maliciously) submits many invoices.
+        $key = 'ocr-invoice:' . $company->id;
+        if (\Illuminate\Support\Facades\RateLimiter::tooManyAttempts($key, 30)) {
+            $retry = \Illuminate\Support\Facades\RateLimiter::availableIn($key);
+            return ['ok' => false, 'error' => "Prea multe importuri OCR. Reîncearcă în {$retry} sec."];
+        }
+        \Illuminate\Support\Facades\RateLimiter::hit($key, 3600); // 30 / hour
+
         $key = data_get($company->settings, 'ai.claude_key');
         if (! $key) {
             return ['ok' => false, 'error' => '⚠️ Lipsește cheia Claude în Setări → AI.'];