refactor: rename Wizamart to Orion across entire codebase

Replace all ~1,086 occurrences of Wizamart/wizamart/WIZAMART/WizaMart
with Orion/orion/ORION across 184 files. This includes database
identifiers, email addresses, domain references, R2 bucket names,
DNS prefixes, encryption salt, Celery app name, config defaults,
Docker configs, CI configs, documentation, seed data, and templates.

Renames homepage-wizamart.html template to homepage-orion.html.
Fixes duplicate file_pattern key in api.yaml architecture rule.

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

docker-compose.yml

@@ -4,8 +4,8 @@ services:
     image: postgres:15
     restart: always
     environment:
-      POSTGRES_DB: wizamart_db
-      POSTGRES_USER: wizamart_user
+      POSTGRES_DB: orion_db
+      POSTGRES_USER: orion_user
       POSTGRES_PASSWORD: secure_password
     volumes:
       - postgres_data:/var/lib/postgresql/data
@@ -13,7 +13,7 @@ services:
     ports:
       - "5432:5432"
     healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U wizamart_user -d wizamart_db"]
+      test: ["CMD-SHELL", "pg_isready -U orion_user -d orion_db"]
       interval: 30s
       timeout: 10s
       retries: 3
@@ -37,7 +37,7 @@ services:
     ports:
       - "8001:8000"  # Use 8001 to avoid conflict with local dev server
     environment:
-      DATABASE_URL: postgresql://wizamart_user:secure_password@db:5432/wizamart_db
+      DATABASE_URL: postgresql://orion_user:secure_password@db:5432/orion_db
       JWT_SECRET_KEY: ${JWT_SECRET_KEY:-your-super-secret-key}
       REDIS_URL: redis://redis:6379/0
       USE_CELERY: "true"
@@ -63,7 +63,7 @@ services:
       - full  # Only start with: docker compose --profile full up -d
     command: celery -A app.core.celery_config worker --loglevel=info -Q default,long_running,scheduled
     environment:
-      DATABASE_URL: postgresql://wizamart_user:secure_password@db:5432/wizamart_db
+      DATABASE_URL: postgresql://orion_user:secure_password@db:5432/orion_db
       REDIS_URL: redis://redis:6379/0
     depends_on:
       db: