Add unit tests and Gitea CI workflow for bug fixes

- Add fetcher/tests/ with 21 tests covering all bug fixes:
  - test_utils: get_with_protocol URL normalization (5 tests)
  - test_config: scheduled_tasks.json PK uniqueness, Celery queue
    settings (7 tests)
  - test_publish: URL routing and view for /task/publish_<id>/ (4 tests)
  - test_template_field: url_detail.html renders images_url field (2 tests)
  - test_search_postprocess: URL host filtering and param stripping (3 tests)
- Replace empty fetcher/tests.py with tests/ package
- Add .gitea/workflows/test.yml: runs on PRs and pushes to main,
  installs dependencies and runs `manage.py test fetcher.tests`

app_urls/fetcher/tests/test_template_field.py

@@ -0,0 +1,62 @@
+from datetime import datetime
+
+from django.test import SimpleTestCase
+from django.template.loader import get_template
+from types import SimpleNamespace
+
+
+def _build_url_item():
+    return SimpleNamespace(
+        id=1,
+        url="https://example.com/article",
+        ts_fetch=datetime(2025, 7, 1, 12, 0, 0),
+        status="valid",
+    )
+
+
+def _build_url_content(images_url=None):
+    return SimpleNamespace(
+        date_published=datetime(2025, 7, 1, 11, 0, 0),
+        title="Example title",
+        description="Example description",
+        content="Example body",
+        valid_content=True,
+        language="en",
+        tags=["a", "b"],
+        authors=["Author"],
+        keywords=["kw"],
+        image_main_url="https://example.com/img.jpg",
+        images_url=images_url,
+        videos_url=["https://example.com/v.mp4"],
+        url_host="https://example.com",
+        site_name="Example",
+    )
+
+
+class UrlDetailTemplateTests(SimpleTestCase):
+    def _render(self, url_content):
+        template = get_template("url_detail.html")
+        context = {
+            "url_item": _build_url_item(),
+            "url_content": url_content,
+            "sources": ["feeds"],
+            "searches": ["child abuse"],
+            "models": ["llama3.2:3b"],
+            "prompt": "Summarize",
+            "url_canonical": None,
+        }
+        return template.render(context)
+
+    def test_image_urls_field_renders(self):
+        html = self._render(_build_url_content(images_url=["https://example.com/1.jpg"]))
+        self.assertIn("https://example.com/1.jpg", html)
+
+    def test_legacy_image_urls_attribute_is_not_referenced(self):
+        # Model exposes `images_url`, not `image_urls`. Rendering the template
+        # must not fail nor silently rely on a non-existent field.
+        with open(
+            "fetcher/templates/url_detail.html"
+        ) as f:
+            source = f.read()
+        self.assertNotIn("url_content.image_urls", source)
+        self.assertIn("url_content.images_url", source)