feat: rework pyproject to allow installing only parts

pyproject.toml

@@ -8,13 +8,26 @@ authors = [
 ]
 requires-python = ">=3.13"
 dependencies = [
-    "beautifulsoup4>=4.14.2",
-    "cloudscraper>=1.2.71",
-    "playwright>=1.55.0",
     "regex>=2025.9.18",
+]
+
+[project.optional-dependencies]
+# SRU API feature: for accessing library catalogs via SRU protocol
+sru = [
     "requests>=2.32.5",
 ]
 
+# Catalogue feature: web scraping local library catalog
+catalogue = [
+    "requests>=2.32.5",
+    "beautifulsoup4>=4.12.0",
+]
+
+# Install all features
+all = [
+    "bibapi[sru,catalogue]",
+]
+
 [build-system]
 requires = ["uv_build >= 0.9.5, <0.10.0"]
 build-backend = "uv_build"