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>

docs/architecture/diagrams/multitenant-diagrams.md

@@ -175,16 +175,16 @@ Customer → DNS → Server → Nginx → FastAPI
 
 FastAPI Middleware:
   host = "store1.platform.com"
-  
+
   Step 1: Custom domain? NO (ends with .platform.com)
   Step 2: Subdomain? YES
           Extract "store1"
-          Query: SELECT * FROM stores 
+          Query: SELECT * FROM stores
                  WHERE subdomain = 'store1'
           Result: Store 1
-  
+
   request.state.store = Store 1
-  
+
 Route → Render Store 1's shop
 ```
 
@@ -195,18 +195,18 @@ Customer → localhost:8000/store/store1/
 FastAPI Middleware:
   host = "localhost:8000"
   path = "/store/store1/"
-  
+
   Step 1: Custom domain? NO (localhost)
   Step 2: Subdomain? NO (localhost has no subdomain)
   Step 3: Path-based? YES
           Extract "store1" from path
-          Query: SELECT * FROM stores 
+          Query: SELECT * FROM stores
                  WHERE subdomain = 'store1'
           Result: Store 1
-  
+
   request.state.store = Store 1
   request.state.clean_path = "/" (strip /store/store1)
-  
+
 Route → Render Store 1's shop
 ```
 
@@ -402,7 +402,7 @@ Value: 123.45.67.89
 TTL: 3600
 
 Type: TXT
-Name: _wizamart-verify
+Name: _orion-verify
 Value: abc123xyz  (verification token from your platform)
 TTL: 3600
 ```

docs/architecture/diagrams/store-domain-diagrams.md

@@ -237,7 +237,7 @@
 │  Exception Handler                         │
 │  app/exceptions/handler.py                 │
 │                                            │
-│  @app.exception_handler(WizamartException) │
+│  @app.exception_handler(OrionException) │
 │  async def custom_exception_handler(...):  │
 │      return JSONResponse(                  │
 │          status_code=exc.status_code,      │
@@ -331,7 +331,7 @@ Step 2: Get Instructions
 ┌────────────────────────────────────┐
 │  System returns instructions:      │
 │  "Add TXT record:                  │
-│   _wizamart-verify.myshop.com      │
+│   _orion-verify.myshop.com      │
 │   Value: abc123..."                │
 └────────────────────────────────────┘
 
@@ -343,7 +343,7 @@ Step 3: Store Adds DNS Record
      ▼
 ┌────────────────────────────────────┐
 │  DNS Provider (GoDaddy/etc)        │
-│  _wizamart-verify.myshop.com TXT   │
+│  _orion-verify.myshop.com TXT   │
 │  "abc123..."                       │
 └────────────────────────────────────┘