feat: Introduce lists and reviews apps, refactor user list functionality from accounts, and add user profile fields.

backend/apps/reviews/models.py

@@ -0,0 +1,56 @@
+from django.db import models
+from django.conf import settings
+from django.contrib.contenttypes.fields import GenericForeignKey
+from django.contrib.contenttypes.models import ContentType
+from apps.core.history import TrackedModel
+import pghistory
+
+@pghistory.track()
+class Review(TrackedModel):
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+        related_name="reviews",
+        help_text="User who wrote the review",
+    )
+    
+    # Generic relation to target object (Park, Ride, etc.)
+    content_type = models.ForeignKey(
+        ContentType,
+        on_delete=models.CASCADE,
+        help_text="Type of item being reviewed",
+    )
+    object_id = models.PositiveIntegerField(help_text="ID of the item being reviewed")
+    content_object = GenericForeignKey("content_type", "object_id")
+
+    # Review content
+    rating = models.PositiveSmallIntegerField(
+        choices=[(i, str(i)) for i in range(1, 6)],
+        help_text="Rating from 1 to 5",
+        db_index=True,
+    )
+    text = models.TextField(blank=True, help_text="Review text (optional)")
+    
+    # Metadata
+    is_public = models.BooleanField(
+        default=True, 
+        help_text="Whether this review is visible to others"
+    )
+    helpful_votes = models.PositiveIntegerField(
+        default=0, 
+        help_text="Number of users who found this helpful"
+    )
+
+    class Meta(TrackedModel.Meta):
+        verbose_name = "Review"
+        verbose_name_plural = "Reviews"
+        ordering = ["-created_at"]
+        # Ensure one review per user per object
+        unique_together = [["user", "content_type", "object_id"]]
+        indexes = [
+            models.Index(fields=["content_type", "object_id"]),
+            models.Index(fields=["rating"]),
+        ]
+
+    def __str__(self):
+        return f"{self.user.username}'s {self.rating}-star review on {self.content_object}"