structure du projet + docker, back: mise en place BD et apps, front: début de dev pour le header et mise en place du thème et css global (override des variables bootstrap)

backend/api/users/signals.py

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+# users/signals.py
+import io
+import random
+from PIL import Image, ImageDraw, ImageFont
+
+from django.conf import settings
+from django.core.files.base import ContentFile
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+
+from .models import User
+
+PALETTE = ["#34344A", "#845A6D", "#D47386", "#C89B7B", "#32746D"]
+
+def initials_for(user: User) -> str:
+    if getattr(user, "initials", None):
+        return user.initials[:2].upper()
+
+    first = (user.first_name or "").strip()
+    last = (user.last_name or "").strip()
+
+    if first and last:
+        return (first[0] + last[0]).upper()
+    if first:
+        return first[:2].upper()
+    # fallback: email
+    return (user.email or "U")[:2].upper()
+
+def generate_avatar_png(text: str, bg_hex: str, size: int = 256) -> bytes:
+    img = Image.new("RGBA", (size, size), bg_hex)
+    draw = ImageDraw.Draw(img)
+
+    font_path = getattr(settings, "AVATAR_FONT_PATH", None)
+    if font_path:
+        font = ImageFont.truetype(font_path, int(size * 0.42))
+    else:
+        font = ImageFont.load_default()
+
+    bbox = draw.textbbox((0, 0), text, font=font)
+    tw, th = bbox[2] - bbox[0], bbox[3] - bbox[1]
+    x = (size - tw) / 2
+    y = (size - th) / 2 - (size * 0.05)
+
+    draw.text((x, y), text, font=font, fill="white")
+
+    out = io.BytesIO()
+    img.save(out, format="PNG", optimize=True)
+    return out.getvalue()
+
+@receiver(post_save, sender=User)
+def set_default_avatar(sender, instance: User, created: bool, **kwargs):
+    if not created:
+        return
+    if instance.image:
+        return
+
+    text = initials_for(instance)
+    bg = random.choice(PALETTE)
+
+    png_bytes = generate_avatar_png(text=text, bg_hex=bg, size=256)
+    filename = f"user_{instance.pk}_avatar.png"
+    instance.image.save(filename, ContentFile(png_bytes), save=False)
+    User.objects.filter(pk=instance.pk).update(
+        image=instance.image.name,
+    )