feat: complete Phase 3 scaffolding (templates, static, Docker, per-app skeletons)

- Per-app skeleton completion: property/client/setting now have services/,
  tasks.py, views.py, urls.py, serializers.py, templates/<app>/, tests/
- admin.py added to all 10 apps (per spec §2.108 / §17.3)
- Top-level templates/: base.html, layouts/{app,auth}.html, components/
  {topbar,sidebar,pagination,toast,modal,empty-state}.html, errors/
  {403,404,500}.html
- static/: css/main.css (Tailwind entry), js/main.js (HTMX toast +
  CSRF wiring per §7.4), vendor/.gitkeep
- tailwind.config.js: Primary teal + neutral slate + semantic colors,
  Inter font stack, z-60/z-70, shadow-xs, slide-in-right animation per
  UI_SYSTEM §2.7/§10.1
- package.json: tailwindcss-only build/watch
- Dockerfile + docker-compose.yml (6 services: web/db/redis/celery/
  celery-beat/tailwind) + docker-compose.prod.yml + Makefile
- tests/ root: conftest.py with TenantClient fixture per §720,
  integration/{property,client,release}/, e2e/, schemathesis skeleton
- Removed empty apps/tenant/models/ (tenant uses models.py per §17.1)

Validated: manage.py check passes; tree matches spec §2 exactly.

apps/client/urls.py

@@ -0,0 +1,5 @@
+from django.urls import path
+
+app_name = "client"
+
+urlpatterns: list = []

apps/property/urls.py

@@ -0,0 +1,5 @@
+from django.urls import path
+
+app_name = "property"
+
+urlpatterns: list = []

apps/setting/urls.py

@@ -0,0 +1,5 @@
+from django.urls import path
+
+app_name = "setting"
+
+urlpatterns: list = []