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-cms/src/infrastructure/http/mod.rs

@@ -1,4 +1,20 @@
-//! HTTP adapter — handler functions and DTOs for CMS REST endpoints.
+//! HTTP adapter — handler functions and DTOs for the CMS REST API.
+//!
+//! Provides hyper-based request handlers and serialisation types for
+//! the CMS HTTP endpoints. Handlers receive domain service trait objects
+//! via dependency injection (Arc-wrapped trait objects) and translate
+//! between HTTP request/response formats and domain types.
+//!
+//! ## Sub-modules
+//! - `dto` — request/response DTO types (JSON serialisation)
+//! - `handlers` — hyper request handler functions
+//!
+//! ## Endpoints
+//! - `GET /settings` — load current application settings
+//! - `PUT /settings` — update application settings
+//! - `GET /memories` — list all memory slugs
+//! - `POST /memories` — create a new memory entry
+//! - `POST /memories/{name}` — (future) update memory
 
 pub mod dto;
 pub mod handlers;