docs: update INSTALLATION.md

Author: wudidapaopao

INSTALLATION.md

@@ -5,55 +5,23 @@ This document will help you install the `chdb-ruby` ruby gem.
 
 ## Installation
 
-### Native Gems 
+### Compilation During Installation 
 
-Native (precompiled) gems are available for recent Ruby versions on these platforms:
+The gem will automatically compile native extensions during installation (`gem install`). Supported platforms are:
 
 - `aarch64-linux` 
 - `arm64-darwin` 
 - `x86_64-linux`
 - `x86_64-darwin`
 
-If you are using one of these Ruby versions on one of these platforms, the native gem is the recommended way to install chdb-ruby.
+The `chdb-ruby` gem does not provide a pure Ruby implementation. Installation will fail if your platform is unsupported.
 
-`chdb-ruby` gem does not provide a pure Ruby implementation. Installation will fail if your platform is unsupported.
+## Runtime Dependencies
 
-## Post-Installation: Setting Up libchdb C++ Library
+The `chdb-ruby` gem requires the `libchdb` C++ library as its core engine. The library will be automatically downloaded during installation. The extension uses `dlopen` to dynamically load the library. No manual configuration is required.
 
-After installing the `chdb-ruby` gem, you must also install the `libchdb` C++ library locally. If the library path is not in your system's default search paths, you'll need to configure the runtime library loading path.
-
-### 1. Download the C++ Library
-
-You can either:
-- Use the automated installation script:
-  ```bash
-  curl -sSL https://github.com/chdb-io/chdb-io.github.io/blob/main/install_libchdb.sh | bash
-  ```
-  
-- Or manually download from chdb releases(example for arm64-darwin (v3.12)):
-  ```bash
-  wget https://github.com/chdb-io/chdb/releases/download/v3.12/macos-arm64-libchdb.tar.gz
-  tar -xzf macos-arm64-libchdb.tar.gz
-  ```
-
-### 2. Configure Library Path
-- MacOS:
-    ```bash
-    export DYLD_LIBRARY_PATH="/path/to/libchdb:$DYLD_LIBRARY_PATH"
-    ```
-  (Add to your shell config file like ~/.zshrc for persistence)
-
-- Linux:
-    ```bash
-    export LD_LIBRARY_PATH="/path/to/libchdb:$LD_LIBRARY_PATH"
-    ```
-
-### 3. Verify Installation
+## Verify Installation
 - Ruby:
     ```bash
     require 'chdb'
     ```
-
-- Troubleshooting(If you get "Library not loaded" errors):
-  - Verify the path in DYLD_LIBRARY_PATH/LD_LIBRARY_PATH is correct
-  - Ensure you downloaded the right version for your platform