docs: tambah doc comment, logging, dan inline comments di semua 255 file

Meliputi:
- File-level //! doc comment: tujuan file, alur kerja, komponen utama
- Function-level /// doc comment: apa, parameter, return, flow, edge cases
- Struct/enum/trait /// doc comment: peran, field docs
- Tracing logging (tracing::info!/debug!/trace!/warn!/error!) di setiap fungsi
- Inline comments untuk variable dan branching logic penting
- Seluruh 8 crates di workspace: zesdex-backend, zesdex-cms, zesdex-entities,
  zesdex-iam, zesdex-infra, zesdex-ipc, zesdex-middleware, zesdex-utils
- Build: 0 errors, 242/242 tests passed

crates/zesdex-backend/src/view/overlays/mod.rs

@@ -24,6 +24,7 @@ use ratatui::text::Span;
 use ratatui::widgets::{Block, Borders, Clear};
 use ratatui::Frame;
 use super::theme::Theme;
+use tracing;
 
 /// Decorate an overlay block with a styled title and matching border color.
 ///
@@ -68,6 +69,7 @@ pub fn render_overlay(
     overlay: crate::app::state::types::Overlay,
     state: &crate::app::state::rest::AppStateRest,
 ) {
+    tracing::debug!("render_overlay: {:?}", overlay);
     let overlay_area = centered_rect(area, 75, 70);
 
     // Clear the area behind the overlay (semi-transparent effect)