[SILO-1026] feat: add estimates external API endpoints (#8664)

* add project summary endpoint

* update response structure

* add estimates external API endpoints with migrations

* fix invalid project and workspace error

apps/api/plane/db/migrations/0121_alter_estimate_type.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.28 on 2026-02-26 14:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('db', '0120_issueview_archived_at'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='estimate',
+            name='type',
+            field=models.CharField(choices=[('categories', 'Categories'), ('points', 'Points')], default='categories', max_length=255),
+        ),
+    ]

apps/api/plane/db/models/estimate.py

@@ -10,11 +10,15 @@ from django.db.models import Q
 # Module imports
 from .project import ProjectBaseModel
 
+class EstimateType(models.TextChoices):
+    CATEGORIES = "categories", "Categories"
+    POINTS = "points", "Points"
+
 
 class Estimate(ProjectBaseModel):
     name = models.CharField(max_length=255)
     description = models.TextField(verbose_name="Estimate Description", blank=True)
-    type = models.CharField(max_length=255, default="categories")
+    type = models.CharField(max_length=255, choices=EstimateType.choices, default=EstimateType.CATEGORIES)
     last_used = models.BooleanField(default=False)
 
     def __str__(self):