complete codex docs

docs/features/FTP_SYSTEM.md

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+# FTP System
+
+## Current State
+
+GSP includes an FTP module and FTP-related provisioning fields.
+
+Important references:
+
+- `Panel/modules/ftp/module.php`
+- `Panel/modules/user_games/module.php`
+- `Panel/modules/server/module.php`
+
+## Current Notes
+
+- FTP remains useful for advanced users.
+- The embedded FTP UI is legacy-heavy and should be treated carefully.
+- FTP credentials need to be protected and easy to reset.
+
+## Recommended Direction
+
+- keep FTP as an advanced access method
+- document it clearly
+- avoid exposing control paths
+- audit the legacy embedded file manager code
+