Re-enable proxy with version constraint for fix

Based on scholarly PR #579 which fixes the FreeProxies compatibility issue,
re-enable proxy support with a version constraint (>=1.7.12) to ensure the
fix is included.

This should resolve the 'Client.__init__() got an unexpected keyword argument
proxies' error while maintaining proxy support for better reliability.

Ref: scholarly-python-package/scholarly#579

Author: cxhernandez

_scripts/environment.yml

@@ -9,4 +9,4 @@ dependencies:
   - markdown
   # Google Scholar crawler (gscrawler.py)
   - pandas
-  - scholarly
+  - scholarly>=1.7.12  # Requires version with proxy fix (PR #579)

_scripts/gscrawler.py

@@ -9,6 +9,7 @@
 
 import pandas as pd
 from bs4 import BeautifulSoup
+from scholarly import ProxyGenerator
 
 # Configure logging
 logging.basicConfig(
@@ -101,14 +102,26 @@ def clean_journal_name(journal):
 
 
 def setup_proxy():
-    """Setup proxy to avoid Google Scholar blocking.
+    """Setup free proxy to avoid Google Scholar blocking.
 
-    Note: Free proxy setup is currently disabled due to compatibility issues.
-    The scholarly package's built-in session management and user-agent
-    handling should be sufficient to avoid most blocking.
+    Uses FreeProxies from the scholarly package to rotate through
+    free proxy servers and avoid 403 errors.
+
+    Requires scholarly>=1.7.12 which includes the proxy fix from PR #579.
     """
-    # Proxy setup disabled - scholarly's session handling is sufficient
-    logger.info("Using scholarly's default session (proxy disabled due to compatibility issues)")
+    try:
+        logger.info("Setting up free proxy to avoid blocking...")
+        from scholarly import scholarly
+        pg = ProxyGenerator()
+        success = pg.FreeProxies()
+        if success:
+            scholarly.use_proxy(pg)
+            logger.info("Proxy setup successful")
+        else:
+            logger.warning("Free proxy setup returned False, continuing without proxy...")
+    except Exception as e:
+        logger.warning(f"Proxy setup failed: {e}. Continuing without proxy...")
+        # Continue without proxy - scholarly will use direct connection
 
 
 def get_author_publications_html(user_id):