refactor: clean up codebase, remove dead code and obsolete docs

Remove influencer-era documentation, unused components, boilerplate
assets, and ghost tiktok cron job. Add supplier invoice management,
document API routes, and PWA icons. Replace boilerplate README.

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

vercel.json

@@ -1,9 +1,5 @@
 {
   "crons": [
-    {
-      "path": "/api/tiktok/cron",
-      "schedule": "0 7 * * *"
-    },
     {
       "path": "/api/deadlines/status/cron",
       "schedule": "0 6 * * *"
@@ -23,6 +19,10 @@
     {
       "path": "/api/banking/sync/cron",
       "schedule": "0 5 * * *"
+    },
+    {
+      "path": "/api/documents/verify/cron",
+      "schedule": "0 3 * * 0"
     }
   ]
 }