docs(readme): update installation instructions and directory structure

- Added recommended install script method using curl
- Reorganized installation section into "Option 1" and "Option 2"
- Cleaned up directory structure overview by removing outdated entries

chore(script): add install.sh for auto installation

- Introduced a Bash script to fetch the latest release from GitHub
- Automatically detects OS and architecture
- Downloads and installs the correct binary to /usr/local/bin

Author: trknhr

README.md

@@ -79,7 +79,13 @@ $ git ch▍    # Press Ctrl+P (zsh Integration)
 
 ## 🛠 Installation
 
-### 1. Install ghosttype
+### Option 1: Install Script (Recommended)
+
+```bash
+curl -sL https://raw.githubusercontent.com/trknhr/ghosttype/main/script/install.sh | bash
+```
+
+### Option 2: Go Install
 
 ```bash
 go install github.com/trknhr/ghosttype@latest
@@ -166,11 +172,7 @@ All models implement a unified `SuggestModel` interface and are combined via `en
 ```
 .
 ├── cmd/            # CLI (tui, suggest, root)
-├── history/        # Loaders for bash/zsh history
-├── model/          # All prediction models
 ├── internal/       # Logging, utils, alias sync
-├── ollama/         # LLM/embedding interface
-├── parser/         # RC and alias parsing
 ├── script/         # Shell helper scripts
 ├── main.go
 └── go.mod

script/install.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -e
+
+REPO="trknhr/ghosttype"
+APP="ghosttype"
+OS=$(uname | tr '[:upper:]' '[:lower:]')
+ARCH=$(uname -m)
+
+# x86_64 → amd64, aarch64 → arm64
+if [ "$ARCH" = "x86_64" ]; then ARCH=amd64; fi
+if [ "$ARCH" = "aarch64" ] || [ "$ARCH" = "arm64" ]; then ARCH=arm64; fi
+
+echo "🔍 Fetching latest release..."
+TAG=$(curl -s https://api.github.com/repos/$REPO/releases/latest | grep tag_name | cut -d '"' -f 4)
+
+echo "⬇️  Downloading $APP $TAG for $OS/$ARCH..."
+FILENAME="${APP}_main_${OS}_${ARCH}.tar.gz"
+URL="https://github.com/$REPO/releases/download/$TAG/$FILENAME"
+echo "📦 URL: $URL"
+curl -L "$URL" -o "${APP}.tar.gz"
+
+echo "📦 Extracting..."
+tar -xzf "${APP}.tar.gz"
+rm "${APP}.tar.gz"
+
+echo "🚀 Installing..."
+chmod +x $APP
+sudo mv $APP /usr/local/bin/
+
+echo "✅ Installed $APP $TAG"