v2.0.1 — collab-attachments size cap + oumta overview tiles

- relay: raise /api/collab-attachments + /api/attachments/upload POST
  size limit from 256KB to 15MB, matching /api/attachments. Previous
  limit silently dropped any collab image >~100KB as 413 (envelope
  overhead pushes even modest JPEGs past the cap), leaving puller
  clients with broken <img src="uploads/..."> references.
- oumta-dashboard: centre overview tiles, bump value font to 56px,
  introduce .oumta-fail alarm state that paints the full tile red with
  white text. Toggled from JS for cluster state=down, workloads down
  >0, and open incidents >0. Fail colour uses --t-danger so it stays
  in sync with the "unavailable" workload labels.

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

config.php

@@ -1,7 +1,7 @@
 <?php
 
 define('APP_NAME', 'hyprcrd');
-define('APP_VERSION', '2.0.0');
+define('APP_VERSION', '2.0.1');
 
 // APP_DEBUG: gates verbose error responses (curl traces, upstream bodies).
 // Off by default; enable via env for local troubleshooting only.