docs: migrate all planning docs from React to GoFiber + HTMX

- New ARCHITECTURE_HTMX.md — comprehensive HTMX architecture doc
- ARCHITECTURE.md — updated to point to HTMX version
- UI_COMPONENTS.md — replaced React tree with HTMX partials
- SPRINT_PLAN.md — all sprint tasks updated for HTMX
- BUILD_SYSTEM.md — simplified (no Vite, no npm)
- TIMELINE.md — 3.5 week HTMX timeline
- PROGRESS.md — updated status + HTMX
- AGENTS.md — updated checkpoint with HTMX decision

docs/ARCHITECTURE.md

@@ -1,42 +1,26 @@
 # Hostkeeper V2 — Architecture
 
-> **Status**: V2 Planning Complete
-> **Last Updated**: 2026-06-29
+> **Status**: Migrasi React → HTMX
+> **Last Updated**: 2026-07-07
+> **Dokumen arsitektur baru**: [ARCHITECTURE_HTMX.md](ARCHITECTURE_HTMX.md)
 > **V1 (existing)**: CLI/TUI SSH/SFTP manager — frozen, no changes.
 
 ---
 
-## 1. System Overview
+## ⚠️ Keputusan Arsitektur
 
-Hostkeeper V2 is a Termius-like cross-platform SSH/SFTP management GUI. The architecture follows a **Go backend + Web UI + Electron/WebView** pattern — the same approach used by Termius, VS Code, Discord, Slack, and Figma.
+Hostkeeper V2 menggunakan **GoFiber + HTMX**, **bukan React/SPA**.
 
-```
-┌──────────────────────────────────────────────────────┐
-│                  ELECTRON / WEBVIEW                   │
-│  Native window, menu bar, tray icon, auto-updater    │
-│                                                       │
-│  ┌─────────────────────────────────────────────────┐  │
-│  │              WEB UI (React + TypeScript)         │  │
-│  │  Host List │ Terminal │ SFTP │ Keys │ Settings   │  │
-│  │  ┌───────────────────────────────────────────┐  │  │
-│  │  │           xterm.js (terminal)             │  │  │
-│  │  └───────────────────────────────────────────┘  │  │
-│  └─────────────────────────────────────────────────┘  │
-│                           │ HTTP + WebSocket          │
-│  ┌─────────────────────────────────────────────────┐  │
-│  │          GO BACKEND (GoFiber v2)                │  │
-│  │  REST API  │  WebSocket  │  SSH  │  SFTP        │  │
-│  │  ┌───────────────────────────────────────────┐  │  │
-│  │  │  pkg/ssh │ pkg/sftp │ pkg/crypto │ ...    │  │  │
-│  │  └───────────────────────────────────────────┘  │  │
-│  └─────────────────────────────────────────────────┘  │
-└──────────────────────────────────────────────────────┘
-           │ Distributed as:
-           ├── .dmg  (macOS)
-           ├── .exe  (Windows)
-           ├── .AppImage (Linux)
-           └── .aab / .ipa (Android / iOS)
-```
+Keputusan ini diambil karena:
+1. Developer lebih nyaman dengan Go daripada JavaScript
+2. ~90% kode adalah Go + HTML template
+3. Hanya ~410 baris JS yang diperlukan (xterm.js, clipboard, toggle)
+4. Build lebih sederhana — tanpa Vite, npm, TypeScript
+5. Bisa berjalan di browser biasa tanpa Electron
+
+**Dokumen arsitektur lengkap ada di** [`ARCHITECTURE_HTMX.md`](ARCHITECTURE_HTMX.md).
+
+---
 
 ### Communication Flow