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>

app/publishers/x_publisher.py

@@ -277,3 +277,38 @@ class XPublisher(BasePublisher):
             return True
         except tweepy.TweepyException:
             return False
+
+    async def get_followers(self, max_results: int = 100) -> List[Dict]:
+        """Obtener lista de followers recientes."""
+        if not self.client:
+            return []
+
+        try:
+            # Obtener ID del usuario autenticado
+            me = self.client.get_me()
+            user_id = me.data.id
+
+            # Obtener followers
+            followers = self.client.get_users_followers(
+                id=user_id,
+                max_results=max_results,
+                user_fields=['username', 'name', 'created_at', 'profile_image_url', 'description']
+            )
+
+            if not followers.data:
+                return []
+
+            return [
+                {
+                    "id": str(user.id),
+                    "username": user.username,
+                    "name": user.name,
+                    "description": user.description,
+                    "profile_image_url": user.profile_image_url,
+                    "created_at": user.created_at.isoformat() if user.created_at else None
+                }
+                for user in followers.data
+            ]
+
+        except tweepy.TweepyException:
+            return []