feat: migrate to bbpb and platformdirs, add dependency version constraints

- Migrate from blackboxprotobuf to bbpb (new PyPI package name)
  - Update pyproject.toml and shell.nix dependencies
  - Import name remains 'blackboxprotobuf' (no code changes)
- Migrate from appdirs to platformdirs
  - Replace deprecated appdirs with actively maintained platformdirs
  - Update grawlix/config.py to use platformdirs.user_config_dir
  - Update dependency declarations in pyproject.toml and shell.nix
- Add minimum version constraints for all dependencies
  - Set requires-python = ">=3.9" (required by httpx and importlib.resources.files())
  - Add Python version classifiers (3.9-3.13)
  - Specify minimum versions: beautifulsoup4>=4.9.0, bbpb>=1.0.0,
    EbookLib>=0.17, httpx>=0.23.0, importlib-resources>=5.0,
    lxml>=4.6.0, platformdirs>=3.0.0, pycryptodome>=3.10.0, rich>=10.0.0
  - Make tomli conditional: only required for Python < 3.11
- Update shell.nix with correct SHA256 hash for bbpb 1.4.2
These changes ensure all dependencies meet minimum version requirements
for Python 3.9+ compatibility and replace deprecated packages with
actively maintained alternatives.

grawlix/config.py

@@ -1,7 +1,7 @@
 from dataclasses import dataclass
 from typing import Optional
 import tomli
-import appdirs
+from platformdirs import user_config_dir
 import os
 
 
@@ -26,7 +26,7 @@ def load_config() -> Config:
 
     :returns: Config object
     """
-    config_dir = appdirs.user_config_dir("grawlix", "jo1gi")
+    config_dir = user_config_dir("grawlix", "jo1gi")
     config_file = os.path.join(config_dir, "grawlix.toml")
     if os.path.exists(config_file):
         try:

pyproject.toml

@@ -6,21 +6,27 @@ authors = [
 description = "CLI tool for downloading ebooks"
 readme = "README.md"
 keywords = ["ebook", "cli", "downloader"]
+requires-python = ">=3.9"
 classifiers = [
     "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
 ]
 dependencies = [
-    "appdirs",
-    "beautifulsoup4",
-    "blackboxprotobuf",
-    "EbookLib",
-    "httpx",
-    "importlib-resources",
-    "lxml",
-    "pycryptodome",
-    "rich",
-    "tomli",
+    "beautifulsoup4>=4.9.0",
+    "bbpb>=1.0.0",
+    "EbookLib>=0.17",
+    "httpx>=0.23.0",
+    "importlib-resources>=5.0",
+    "lxml>=4.6.0",
+    "platformdirs>=3.0.0",
+    "pycryptodome>=3.10.0",
+    "rich>=10.0.0",
+    "tomli>=1.0.0; python_version<'3.11'",
 ]
 dynamic = ["version"]