Rework the multi custom-provider design per maintainer review:
1. Data model: use server-generated uuid4 short id as primary key;
'name' is now a pure display label that can be freely renamed.
2. Routing: drop 'custom_active_provider'; activate a provider by
setting bot_type to 'custom:<id>'. Single source of truth — no
pointer drift between bot_type and a separate active selector.
3. Security: drag_sensitive() now recursively masks api_key/secret in
nested structures (custom_providers list); previously only top-level
string fields were masked.
4. Per-provider model: the provider's 'model' field now takes effect on
the main chat path and agent path (was silently ignored before).
5. XSS fix: replace all inline onclick handlers in custom-provider UI
with data-* attributes + event delegation. Provider names never
appear in executable HTML contexts.
Legacy compatibility: bot_type='custom' (no colon) still reads the flat
custom_api_key/custom_api_base fields byte-for-byte identically.
Closes: consolidates #2876 into this PR as requested.
Ref: #2838
Adds first-class support for configuring more than one custom
OpenAI-compatible provider (e.g. SiliconFlow, DeepSeek, local vLLM)
and switching the active one from the web console, addressing #2838.
Backend:
- config: new `custom_providers` (list) and `custom_active_provider`
fields, fully backward compatible with the legacy single
`open_ai_api_base`/`model` fields (used as fallback).
- models/custom_provider.py: centralized resolver
`resolve_custom_credentials()` returning (api_key, api_base, model),
with active-provider selection and graceful fallback.
- chat_gpt_bot.py wired to use the resolver.
- web_channel.py: `_provider_overview` expands `custom_providers` into
one card per provider (id `custom:<name>`, active flag, masked key);
new POST actions `set_custom_provider`, `delete_custom_provider`,
`set_active_custom_provider` with hermetic persistence + bridge reset.
Frontend:
- console.js: dedicated "Custom providers" section with add / edit /
delete / set-active actions, masked-key keep-existing handling, and
~20 new zh/en i18n strings.
- chat.html: custom provider modal.
Tests:
- tests/test_custom_provider.py (11) - resolver/config behavior.
- tests/test_custom_provider_handlers.py (18) - write-side handlers and
overview expansion, including duplicate-name rejection.
All 29 unit tests pass.
