- Add ProxyHost, CaddyConfig, RemoteServer, SSL, AccessList, User, Setting, ImportSession models
- Implement ProxyHostService and RemoteServerService with domain/name uniqueness validation
- Add Caddyfile import handler with conflict detection and user review workflow
- Create ProxyHostHandler and RemoteServerHandler with full CRUD operations
- Wire up Gin/GORM/SQLite dependencies and create missing internal packages
- Add database connection layer, server routing, and version info
- Update routes to register all new handlers and auto-migrate models
- Configure import environment variables and mount points
Addresses Issue #5 (data persistence) and Issue #43 (remote servers)
Backend now compiles cleanly with go build
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