fix: increase general rate limit from 100 to 1000 per 15min

100 requests/15min was far too low for a dashboard with auto-refresh
polling every 10-30 seconds, causing 429s on TOTP config, site config,
license status and other endpoints after ~3 minutes of normal use.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dashcaddy-api/constants.js

@@ -69,7 +69,7 @@ const SESSION_TTL = {
 const RATE_LIMITS = {
   GENERAL: {
     windowMs: 15 * 60 * 1000,   // 15 minutes
-    max: 100,
+    max: 1000,
   },
   STRICT: {
     windowMs: 15 * 60 * 1000,