- Creates backend/ai/provider_config.py as a pure data module (no provider imports)
- ProviderConfig(BaseModel) with extra=forbid: provider_id, api_key, base_url, model, context_chars
- PROVIDER_DEFAULTS dict with all 10 providers and verbatim base_url/model/context_chars from RESEARCH.md
- SUPPORTS_JSON_MODE dict with gemini=False per JSON Compatibility Matrix (D-02)
- Add backend/ai/utils.py — parse_classification, parse_suggestions, strip_code_fences
shared by all AI providers; removes duplicated private functions from
anthropic_provider.py and openai_provider.py
- Add backend/deps/utils.py — get_client_ip, parse_uuid request-parsing helpers;
removes local _ip() variants from admin.py, auth.py, shares.py, folders.py
- Add backend/storage/exceptions.py — canonical CloudConnectionError definition;
all routers and backends import from here instead of redefining
- Move validate_password_strength to backend/services/auth.py; removes duplicated
_validate_password_strength from admin.py and auth.py
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
curo1305