Introduce DomainBaseModel in src/cleveragents/domain/models/base.py that
defines the single shared model_config (str_strip_whitespace, validate_assignment,
arbitrary_types_allowed=False, populate_by_name, use_enum_values) previously
duplicated verbatim across five domain model files.
Update 14 classes across five files to inherit from DomainBaseModel instead
of pydantic.BaseModel directly, removing all inline model_config duplication:
- aimodelscredentials/ai_models_credentials.py (ModelProviderOption)
- aimodelserrors/ai_models_errors.py (ModelError, FallbackResult)
- aimodelsproviders/ai_models_providers.py (ModelProviderExtraAuthVars,
ModelProviderConfigSchema)
- auth/auth.py (AuthHeader, TrialPlansExceededError, TrialMessagesExceededError,
BillingError, ApiError, ClientAccount, ClientAuth)
- planconfig/plan_config.py (PlanConfig, ConfigSetting)
Pure structural refactor — no behavioral changes. Models with different
configurations (acms, aimodels_custom, etc.) are left untouched.
Add BDD feature (22 scenarios) and Robot integration tests (8 test cases)
verifying inheritance, config correctness, and no-duplication invariants.
ISSUES CLOSED: #1941
