feat(config): add UI metadata to ModelConfig fields
Add json_schema_extra UI metadata to all Model-related configuration classes:
- APIProvider (7 fields): name, base_url, api_key, client_type, max_retry, timeout, retry_interval
- ModelInfo (8 fields): model_identifier, name, api_provider, price_in, price_out, temperature, max_tokens, force_stream_mode, extra_params
- TaskConfig (5 fields): model_list, max_tokens, temperature, slow_threshold, selection_strategy
- ModelTaskConfig (9 fields): utils, replyer, vlm, voice, tool_use, planner, embedding, lpmm_entity_extract, lpmm_rdf_build
Pattern: Field(default=..., [ge/le constraints], json_schema_extra={x-widget, x-icon, [step]})
Widget types: input, slider, switch, select, custom (for complex types)
Constraints mapped: ge/le to minValue/maxValue in Schema output (Task 1d)
All 30 user-facing fields now have complete metadata coverage:
- x-widget: rendering hint for frontend
- x-icon: icon identifier from lucide-react
- Constraints: ge, le for numeric validation
Verification:
✓ All classes import successfully
✓ 100% metadata coverage on user-facing fields
✓ Config instance creation works
✓ Backward compatible with existing validation
Relates to: Task 12 (Wave 3) of webui-config-visualization-refactor
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