chore: Apply modern Go idioms and perform code cleanup

This commit introduces a series of small refactorings and style fixes across the codebase to improve consistency and leverage modern Go features.

Key changes include:
- Adopting the Go 1.22 `reflect.TypeFor` generic function.
- Replacing `interface{}` with the `any` type alias for better readability.
- Using the explicit `http.NoBody` constant for HTTP requests.
- Updating octal literals for file permissions to the `0o` prefix syntax.
- Standardizing comment formatting and fixing minor typos.
- Removing redundant blank lines and organizing imports.

internal/exporters/docx.go

@@ -8,11 +8,12 @@ import (
 	"strings"
 
 	"github.com/fumiama/go-docx"
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
+
 	"github.com/kjanat/articulate-parser/internal/interfaces"
 	"github.com/kjanat/articulate-parser/internal/models"
 	"github.com/kjanat/articulate-parser/internal/services"
-	"golang.org/x/text/cases"
-	"golang.org/x/text/language"
 )
 
 // DocxExporter implements the Exporter interface for DOCX format.