feat: Add follower tracking to interactions

- Add get_followers() method to X publisher
- Track new followers as "follow" interaction type
- Update daily reports to show followers separately
- Store follower name, username, bio, and profile image

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

worker/tasks/fetch_interactions.py

@@ -138,9 +138,44 @@ def fetch_platform_interactions(platform: str):
                     processed_ids.add(external_id)
                     new_comments += 1
 
+        # Obtener nuevos followers (solo para X por ahora)
+        new_follows = 0
+        if platform == "x" and hasattr(publisher, 'get_followers'):
+            followers = run_async(publisher.get_followers(max_results=100))
+
+            for follower in followers:
+                # Usar "follow_" prefix para distinguir de tweet IDs
+                follower_id = follower.get("id")
+                external_id = f"follow_{follower_id}"
+
+                if external_id in processed_ids:
+                    continue
+
+                existing = db.query(Interaction).filter(
+                    Interaction.external_id == external_id
+                ).first()
+
+                if not existing:
+                    interaction = Interaction(
+                        platform=platform,
+                        interaction_type="follow",
+                        external_id=external_id,
+                        author_username=follower.get("username", "unknown"),
+                        author_name=follower.get("name"),
+                        author_avatar_url=follower.get("profile_image_url"),
+                        content=follower.get("description"),  # Bio del usuario
+                        interaction_at=datetime.utcnow()  # No sabemos cuándo siguió exactamente
+                    )
+                    db.add(interaction)
+                    processed_ids.add(external_id)
+                    new_follows += 1
+
         db.commit()
 
-        return f"{platform}: {new_mentions} menciones, {new_comments} comentarios nuevos"
+        result = f"{platform}: {new_mentions} menciones, {new_comments} comentarios"
+        if new_follows > 0:
+            result += f", {new_follows} follows nuevos"
+        return result
 
     except Exception as e:
         db.rollback()