feat: Add continent and park type fields to Park and ParkLocation models; update API filters and documentation

backend/apps/parks/models/parks.py

@@ -36,6 +36,28 @@ class Park(TrackedModel):
         max_length=20, choices=STATUS_CHOICES, default="OPERATING"
     )
 
+    PARK_TYPE_CHOICES = [
+        ("THEME_PARK", "Theme Park"),
+        ("AMUSEMENT_PARK", "Amusement Park"),
+        ("WATER_PARK", "Water Park"),
+        ("FAMILY_ENTERTAINMENT_CENTER", "Family Entertainment Center"),
+        ("CARNIVAL", "Carnival"),
+        ("FAIR", "Fair"),
+        ("PIER", "Pier"),
+        ("BOARDWALK", "Boardwalk"),
+        ("SAFARI_PARK", "Safari Park"),
+        ("ZOO", "Zoo"),
+        ("OTHER", "Other"),
+    ]
+
+    park_type = models.CharField(
+        max_length=30,
+        choices=PARK_TYPE_CHOICES,
+        default="THEME_PARK",
+        db_index=True,
+        help_text="Type/category of the park"
+    )
+
     # Location relationship - reverse relation from ParkLocation
     # location will be available via the 'location' related_name on
     # ParkLocation