CreateUser, GetUserByNick, GetUserByToken exist in both db.go (model-based,
used by tests) and queries.go (simple, used by handlers). Rename the
model-based variants to CreateUserModel, GetUserByNickModel, and
GetUserByTokenModel to resolve the compilation error.
- Fix stuttering type names (e.g. config.ConfigParams → config.Params)
- Add doc comments to all exported types/functions/methods
- Add package doc comments to all packages
- Fix JSON tags to camelCase
- Extract magic numbers to constants
- Add blank lines per nlreturn/wsl_v5 rules
- Use errors.Is() for error comparison
- Unexport NewLoggingResponseWriter (not used externally)
- Replace for-range on ctx.Done() with channel receive
- Rename unused parameters to _
- AGENTS.md: all changes via feature branches, no direct main commits
- internal/models/model.go: DB interface + Base struct for all models
- internal/models/channel.go: Channel model with DB access for relation queries
- Database.NewChannel() factory injects db reference into model instances
- Uses interface to avoid circular imports (models -> db)
