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/models/__init__.py

@@ -1,6 +1,15 @@
-"""Models package."""
+{"""Models package."""
 
-from docgen.models.endpoint import Endpoint, Parameter, Response, HTTPMethod, ParameterIn
 from docgen.models.config import DocConfig, OutputFormat, Theme
+from docgen.models.endpoint import Endpoint, HTTPMethod, Parameter, ParameterIn, Response
 
-__all__ = ["Endpoint", "Parameter", "Response", "HTTPMethod", "ParameterIn", "DocConfig", "OutputFormat", "Theme"]
+__all__ = [
+    "Endpoint",
+    "Parameter",
+    "Response",
+    "HTTPMethod",
+    "ParameterIn",
+    "DocConfig",
+    "OutputFormat",
+    "Theme",
+]