* feat: pass resolved capabilities through to providers, add server compat layer
The LLMProvider protocol previously forced providers to re-derive
capabilities from static lookup tables, ignoring config overrides set
via the admin UI or config.toml (e.g. thinking_mode, token_param).
This adds an optional capabilities parameter to create_streaming and
create_completion so the session can pass its config-merged
ModelCapabilities through to providers.
On top of this, adds a server compatibility layer for local model
servers (vLLM, llama.cpp). Profiles suggest thinking mode and server
workarounds (skip_special_tokens for vLLM, reasoning_format for
llama.cpp) during model detection, with structured admin UI fields
for server type, thinking mode, and extra body params.
Verified against real vLLM (Gemma 4 31B) and llama.cpp (Gemma 4 E4B)
servers.
* fix: defensive copy in _finalize_extra_body, expose thinking_param in UI
Shallow-copy extra_params and its chat_template_kwargs in the provider
before _apply_thinking_mode mutates them, so callers that reuse the
same dict across models are safe.
Replace the hidden thinking_param input with a visible text field
that appears when thinking mode is enabled. Shows the default
"enable_thinking" and hints that Granite/DeepSeek use "thinking".
* fix: address Copilot review feedback on admin UI and server compat
- Preserve unrepresentable thinking_mode values (e.g. "adaptive") in
raw capabilities JSON instead of silently dropping on edit round-trip
- Validate capabilities and extra body JSON are plain objects, not
arrays or primitives
- Deep-merge chat_template_kwargs from extra_body instead of silently
dropping, so operators can extend/override template kwargs
* fix: hide server compat section for non-local providers
The Server Compatibility fields (server type, thinking mode, extra
body) only apply to openai-compatible (local model servers). Hide
the entire section when the provider is openai, anthropic, or google.
* fix: normalize capsObj to plain object on edit load
Defend against DB rows where capabilities is a JSON literal null,
an array, or a primitive — previous code would crash on the
capsObj.server_compat / capsObj.thinking_mode reads. Same defensive
check also applied to the server_compat nested value.
* refactor: extract _isPlainObject helper for JSON type checks
Consolidates the null/array/typeof check that was inlined at three
different call sites into a single helper. Keeps the intent obvious
at each use site and avoids the awkward multi-condition ternary.
Patrick Buckley