Rename project from nginx-test to sqlite-serve

- Updated package name in Cargo.toml: nginx-test → sqlite-serve
- Updated library name: libnginx_test.dylib → libsqlite_serve.dylib
- Updated all load_module directives in nginx configs
- Updated build checks in start scripts
- Updated branding in footer template
- Updated project name in all README files

The name 'sqlite-serve' better reflects the module's purpose:
serving dynamic content from SQLite databases via NGINX.

README_BOOK_CATALOG.md

@@ -1,6 +1,6 @@
 # Book Catalog Example
 
-A complete example demonstrating the nginx-test SQLite module with a read-only book catalog.
+A complete example demonstrating the sqlite-serve module with a read-only book catalog.
 
 ## Features
 
@@ -54,7 +54,7 @@ Open your browser to:
 ## Directory Structure
 
 ```
-nginx-test/
+sqlite-serve/
 ├── book_catalog.db                      # SQLite database
 ├── setup_book_catalog.sh                # Database setup script
 ├── conf/