feat(rewrite): add remove_img_blur_params rule

Adds a new content rewrite rule to strip image URL query parameters from blurred images.

This addresses issues with sites like Belgian national news that use blurry placeholder images which get replaced with high-quality versions, allowing Miniflux to fetch the original images instead of the placeholders.

internal/reader/rewrite/content_rewrite_functions.go

@@ -10,6 +10,7 @@ import (
 	"log/slog"
 	"net/url"
 	"regexp"
+	"strconv"
 	"strings"
 	"unicode"
 
@@ -547,3 +548,43 @@ func fixGhostCards(entryContent string) string {
 	output, _ := doc.FindMatcher(goquery.Single("body")).Html()
 	return strings.TrimSpace(output)
 }
+
+func removeImgBlurParams(entryContent string) string {
+	doc, err := goquery.NewDocumentFromReader(strings.NewReader(entryContent))
+	if err != nil {
+		return entryContent
+	}
+
+	changed := false
+
+	doc.Find("img[src]").Each(func(i int, img *goquery.Selection) {
+		srcAttr, exists := img.Attr("src")
+		if !exists {
+			return
+		}
+
+		parsedURL, err := url.Parse(srcAttr)
+		if err != nil {
+			return
+		}
+
+		// Only strip query parameters if this is a blurry placeholder image
+		if parsedURL.RawQuery != "" {
+			// Check if there's a blur parameter with a non-zero value
+			if blurValue := parsedURL.Query().Get("blur"); blurValue != "" {
+				if blurInt, err := strconv.Atoi(blurValue); err == nil && blurInt > 0 {
+					parsedURL.RawQuery = ""
+					img.SetAttr("src", parsedURL.String())
+					changed = true
+				}
+			}
+		}
+	})
+
+	if changed {
+		output, _ := doc.FindMatcher(goquery.Single("body")).Html()
+		return output
+	}
+
+	return entryContent
+}