feat: setup wizard via SSH tunnel, config volume architecture

- Wizard binds 127.0.0.1 only, requires SSH tunnel for access
- Shared config volume: wizard writes, backend reads
- Backend waits for config file before starting uvicorn
- Frontend detects backend health, shows setup wizard if not ready
- Remove wizard-init container and init-config directory
- Remove backend volume mount of source code
- Update README with full deployment flow

.env.example

@@ -1,4 +1,4 @@
-# MySQL
+# MySQL (docker-compose 内部默认值，wizard 配置优先)
 MYSQL_ROOT_PASSWORD=harborforge_root
 MYSQL_DATABASE=harborforge
 MYSQL_USER=harborforge
@@ -10,10 +10,10 @@ SECRET_KEY=change_me_in_production
 LOG_LEVEL=INFO
 BACKEND_PORT=8000
 
-# AbstractWizard
-WIZARD_URL=http://wizard:8080
-WIZARD_CONFIG=harborforge.json
+# AbstractWizard (localhost only)
+WIZARD_PORT=18080
 
 # Frontend
 FRONTEND_PORT=3000
 VITE_API_BASE=/api
+VITE_WIZARD_PORT=18080