Add daily-stone page showing a different mineral each day

New dailystone app with 207 minerals scraped from Wikipedia.
Each day displays a different mineral with photos, formula,
properties, description, and history. Page theme color matches
the mineral's typical appearance.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dailystone/models.py

@@ -0,0 +1,25 @@
+from django.db import models
+
+
+class Mineral(models.Model):
+    name = models.CharField(max_length=200, unique=True)
+    formula = models.CharField(max_length=200, blank=True)
+    category = models.CharField(max_length=200, blank=True)
+    crystal_system = models.CharField(max_length=200, blank=True)
+    mohs_hardness = models.CharField(max_length=50, blank=True)
+    luster = models.CharField(max_length=200, blank=True)
+    streak = models.CharField(max_length=200, blank=True)
+    specific_gravity = models.CharField(max_length=100, blank=True)
+    color_description = models.CharField(max_length=300, blank=True)
+    color_hex = models.CharField(max_length=7, default='#6b7280')
+    description = models.TextField(blank=True)
+    history = models.TextField(blank=True)
+    image_urls = models.JSONField(default=list)
+    wikipedia_url = models.URLField(max_length=500, blank=True)
+    day_of_year = models.IntegerField(unique=True, null=True, blank=True)
+
+    class Meta:
+        ordering = ['day_of_year']
+
+    def __str__(self):
+        return self.name