Add accounts app: custom User, Member, families & guardianship

Introduce the foundational accounts app:
- Custom email-as-username User (AbstractBaseUser + PermissionsMixin) set
  as AUTH_USER_MODEL, decoupled from membership so children can be members
  without a login.
- Member model holding personal/roster data (names, contact email, phone +
  emergency phone via django-phonenumber-field, license number, DOB) with an
  optional link to a User.
- Family household grouping and directional Guardianship (guardian -> child)
  with uniqueness and no-self-guardian constraints.
- Custom UserAdmin plus Member/Family admin with inlines and autocomplete.
- Settings: register apps, AUTH_USER_MODEL, phonenumber defaults (BE/E164).
- Add CLAUDE.md and a tracked static/ directory.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

uv.lock

@@ -18,6 +18,7 @@ source = { virtual = "." }
 dependencies = [
     { name = "dj-database-url" },
     { name = "django" },
+    { name = "django-phonenumber-field", extra = ["phonenumbers"] },
     { name = "python-decouple" },
 ]
 
@@ -30,6 +31,7 @@ dev = [
 requires-dist = [
     { name = "dj-database-url", specifier = ">=3.1.2" },
     { name = "django", specifier = ">=6.0.6" },
+    { name = "django-phonenumber-field", extras = ["phonenumbers"], specifier = ">=8.4.0" },
     { name = "python-decouple", specifier = ">=3.8" },
 ]
 
@@ -62,6 +64,32 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/eb/50/23f9dc45483419a3cc2085b498b25adfbf10642b2941c73e6d2dfaffc9ab/django-6.0.6-py3-none-any.whl", hash = "sha256:25148b1194c47c2e685e5f5e9c5d59c78b075dfd282cb9618861ba6c1708f4d2", size = 8373354, upload-time = "2026-06-03T13:02:41.72Z" },
 ]
 
+[[package]]
+name = "django-phonenumber-field"
+version = "8.4.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "django" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/87/bf/8aa60c9834773b955dff1ddea842e361e8daaf6b0945d5bfc29fc66d53ab/django_phonenumber_field-8.4.0.tar.gz", hash = "sha256:2b83e843dac35eec6a69880a166487235b737a71a1e38c9a52e5ad67d6996083", size = 45512, upload-time = "2025-11-24T15:09:51.904Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/8b/a3/f6b85a9246e22cf719752ad83f5e95aa9ba12419b2f9eff70f20d30e55df/django_phonenumber_field-8.4.0-py3-none-any.whl", hash = "sha256:7a1cb3a6456edb54d879f11ffa0acb227ded08c93b587035d0f28093f0e46511", size = 69528, upload-time = "2025-11-24T15:09:45.479Z" },
+]
+
+[package.optional-dependencies]
+phonenumbers = [
+    { name = "phonenumbers" },
+]
+
+[[package]]
+name = "phonenumbers"
+version = "9.0.33"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/75/37/dfc4cf24169f1a7169ebaedaf896c818f0add8603409d1e748e3085ccdc0/phonenumbers-9.0.33.tar.gz", hash = "sha256:9ab8a02b940b90c64f3866c0b25a30e567ddf7bb9836a3e11efdb0478f65fc1c", size = 2306756, upload-time = "2026-06-22T10:23:33.428Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/e6/29/f7e30e3dbd3c7e3d9c4a55006112c04ee62b4765a31f21bcc28c253ac3f1/phonenumbers-9.0.33-py2.py3-none-any.whl", hash = "sha256:ba1d0da52711d5fdda6b2b673b2621fe80774fc5d1b2e5a6ef783396b0343186", size = 2595422, upload-time = "2026-06-22T10:23:29.925Z" },
+]
+
 [[package]]
 name = "python-decouple"
 version = "3.8"