Replace fragile Niadd patch with patch script

.gitea/workflows/build.yml

@@ -6,7 +6,7 @@ on:
       - main
     paths:
       - ".gitea/workflows/build.yml"
-      - "patches/**"
+      - "scripts/**"
   workflow_dispatch:
 
 env:
@@ -62,21 +62,34 @@ jobs:
           git -C work/Futon rev-parse HEAD
           git -C work/kotatsu-parsers-redo rev-parse HEAD
 
-      - name: Check and apply Niadd parser patch
+      - name: Apply Niadd parser modifications
         shell: bash
         run: |
           set -euxo pipefail
 
-          PATCH_FILE="${PWD}/patches/ninemanga-niadd.patch"
+          python3 scripts/patch_ninemanga_niadd.py \
+            work/kotatsu-parsers-redo
 
-          git -C work/kotatsu-parsers-redo apply --check "${PATCH_FILE}"
-          git -C work/kotatsu-parsers-redo apply "${PATCH_FILE}"
+          PARSER_FILE="work/kotatsu-parsers-redo/src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/NineMangaParser.kt"
 
-          grep -F '"ru.niadd.com"' \
-            work/kotatsu-parsers-redo/src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/NineMangaParser.kt
+          echo "=== Verify Niadd domain ==="
+          grep -F '"ru.niadd.com"' "${PARSER_FILE}"
 
-          grep -F '@MangaSourceParser("NINEMANGA_RU", "Niadd Русский", "ru")' \
-            work/kotatsu-parsers-redo/src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/NineMangaParser.kt
+          echo "=== Verify source annotation ==="
+          grep -F '@MangaSourceParser("NINEMANGA_RU", "Niadd Русский", "ru")' "${PARSER_FILE}"
+
+          echo "=== Verify Niadd pagination ==="
+          grep -F 'domain.endsWith("niadd.com")' "${PARSER_FILE}"
+
+          echo "=== Ensure old Russian domain is gone ==="
+          if grep -F '"ru.ninemanga.com"' "${PARSER_FILE}"; then
+            echo "ERROR: old ru.ninemanga.com domain is still present"
+            exit 1
+          fi
+
+          echo "=== Resulting diff ==="
+          git -C work/kotatsu-parsers-redo diff -- \
+            src/main/kotlin/org/koitharu/kotatsu/parsers/site/all/NineMangaParser.kt
 
       - name: Connect Futon to patched local parsers
         shell: bash