Reorg: Move nextcloud deployment to docs/deployment/

docs/deployment/nextcloud.md

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+# NextCloud Deployment - World Downloads Portal
+
+**Date:** February 9, 2026  
+**Server:** Ghost VPS (64.50.188.14)  
+**Status:** ✅ OPERATIONAL  
+**Service:** 7 of 7 (Phase 0.5: 100% complete)
+
+---
+
+## Deployment Summary
+
+**Duration:** ~2.5 hours (including troubleshooting)  
+**URL:** https://downloads.firefrostgaming.com
+
+**Components:**
+- NextCloud 32.0.5
+- PostgreSQL database
+- PHP 8.3-FPM
+- Nginx reverse proxy
+- SSL certificate (Let's Encrypt)
+
+---
+
+## Key Challenges Resolved
+
+1. PostgreSQL php-pgsql module required
+2. Nginx directory listing disabled (removed $uri/)
+3. Proper permissions (www-data ownership)
+4. Trusted domains configured
+5. Browser cache cleared
+
+---
+
+**Fire + Frost = Where Passion Meets Precision** 🔥❄️