fix: resolve CI linting violations

- Fixed import sorting in cli.py, __main__.py, detectors/__init__.py, base.py, python.py, rust.py, openapi.py, models/__init__.py
- Removed unused imports (sys, asyncio, Observer, Text, Parameter, ParameterIn, HTTPMethod, DocConfig, List, Optional)
- Removed trailing whitespace from blank lines
- Split lines exceeding 100 characters
- Added missing __init__ docstrings in generators and static/templates packages

src/docgen/detectors/base.py

@@ -1,12 +1,13 @@
-"""Base detector abstract class."""
+{"""Base detector abstract class."""
 
 from abc import ABC, abstractmethod
 from pathlib import Path
-from typing import TYPE_CHECKING, Optional
+from typing import TYPE_CHECKING
+
 from docgen.models import Endpoint
 
 if TYPE_CHECKING:
-    from typing import List
+    pass
 
 
 class BaseDetector(ABC):