Improve outreach compose, contact merge, and email assets.

Add a Quill email editor with DB-backed image storage, selectable PCM designs, postcard defaults for addressed contacts, and merge-by-phone/address on the contact form.

site/messaging/models.py

@@ -113,3 +113,31 @@ class ProviderEvent(TimeStampedModel):
     provider = models.CharField(max_length=64)
     event_type = models.CharField(max_length=64)
     payload = models.JSONField(default=dict, blank=True)
+
+
+class StoredFile(UUIDPrimaryKeyModel, TimeStampedModel):
+    """Binary file blob in the database (no filesystem media storage)."""
+
+    class Kind(models.TextChoices):
+        CAMPAIGN_IMAGE = "campaign_image", "Campaign image"
+
+    kind = models.CharField(
+        max_length=32, choices=Kind.choices, default=Kind.CAMPAIGN_IMAGE
+    )
+    filename = models.CharField(max_length=255, blank=True)
+    content_type = models.CharField(max_length=128)
+    size = models.PositiveIntegerField(default=0)
+    data = models.BinaryField()
+    uploaded_by = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        related_name="uploaded_files",
+    )
+
+    class Meta:
+        ordering = ["-created_at"]
+
+    def __str__(self) -> str:
+        return self.filename or str(self.pk)