[doom] Add gptel-tool-library package

Integrate gptel-tool-library by:
- Adding package definition to packages.el with custom recipe
- Configuring library settings and module loading in config.el
- Enabling module-specific functionality for bbdb, buffer, etc.

home/modules/emacs/doom/packages.el

@@ -55,3 +55,7 @@
 
 (package! claude-code-ide
   :recipe (:host github :repo "manzaltu/claude-code-ide.el"))
+
+(package! gptel-tool-library
+  :recipe (:host github :repo "aard-fi/gptel-tool-library"
+           :files ("*.el")))