feat(render+node-agent+admin): install fonts on all render nodes + verify

Push a font once → every node installs it → admin sees per-node status.

- render-svc: font_requests + node_fonts tables (mig 25); admin GET/POST/DELETE
  /v1/node-fonts (with per-node status matrix); internal (HMAC) GET pending +
  POST status for node-agents
- node-agent: fontSyncLoop polls pending fonts every 60s, downloads, installs
  (Windows Fonts dir + registry / macOS / linux fc-cache), reports Installed/Failed
- gateway: /v1/node-fonts/* → render
- admin /admin/node-fonts: upload a .ttf/.otf → install on all nodes; per-node
  Installed/Pending/Failed badges + counts + delete

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

messages/en.json

@@ -334,7 +334,8 @@
       "comments": "Comments",
       "routes": "Internal Routes",
       "integrations": "Integrations",
-      "projects": "Projects"
+      "projects": "Projects",
+      "nodeFonts": "Node Fonts"
     },
     "appAdminNodesPage": {
       "title": "Render Nodes",

messages/fa.json

@@ -334,7 +334,8 @@
       "comments": "نظرات",
       "routes": "مسیرهای داخلی",
       "integrations": "یکپارچه‌سازی‌ها",
-      "projects": "پروژه‌ها"
+      "projects": "پروژه‌ها",
+      "nodeFonts": "فونت نودها"
     },
     "appAdminNodesPage": {
       "title": "نودهای رندر",