Extract reqwest client creation into dedicated HttpClient abstraction that handles both TCP and Unix socket connections transparently. Simplifies proxy logic by removing duplicate URL construction and client selection throughout the codebase.
- Split monolithic src/db.rs (1122 lines) into domain modules: projects, tags, settings
- Extract API handlers from main.rs into separate handler modules by domain
- Add proxy module for ISR/SSR coordination with Bun process
- Introduce AppState for shared application context
- Add utility functions for asset serving and request classification
- Remove obsolete middleware/auth.rs in favor of session checks in handlers
