Make optional search imports lazy to avoid GitHub dependency in CI

Wrap gnews, GoogleNews, and search_engines imports in try/except
so the module loads without those packages installed. This allows
the test suite to run on the Gitea runner without outbound GitHub
access.

Also revert requirements.txt back to the GitHub URL for the
Search-Engines-Scraper dependency.

Co-Authored-By: opencode <noreply@opencode.ai>

app_urls/fetcher/src/fetch_search_instances.py

@@ -8,10 +8,26 @@ from .logger import get_logger
 logger = get_logger()
 
 from furl import furl
-from gnews import GNews
 from ddgs import DDGS
+
+try:
+    from gnews import GNews
+except ImportError:
+    GNews = None
+    logger.warning("gnews not installed — SearchGNews disabled")
+
+try:
     from GoogleNews import GoogleNews
+except ImportError:
+    GoogleNews = None
+    logger.warning("GoogleNews not installed — SearchGoogleNews/SearchGoogleGeneral/SearchGoogleNewsRSS disabled")
+
+try:
     from search_engines import Yahoo, Aol
+except ImportError:
+    Yahoo = None
+    Aol = None
+    logger.warning("search_engines not installed — SearchYahooGeneral/SearchAOLGeneral disabled")
 
 ###########################################################################
 ###########################################################################

app_urls/requirements.txt

@@ -14,7 +14,7 @@ googlenewsdecoder
 gnews
 GoogleNews
 ddgs
-git+https://gitea.matitos.org/matitos/search-engines-scraper.git
+git+https://github.com/tasos-py/Search-Engines-Scraper.git
 furl
 langdetect
 ollama