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4b10c0b885
### What problem does this PR solve?
`ChatStreamlyWithSender` in two Go model drivers could panic on nil
pointer dereferences when a caller passes a nil model config or omits
the reasoning `Effort`:
- **deepseek.go** - `switch *chatModelConfig.Effort` dereferenced
`Effort` without a nil check. It now defaults to `"high"` when nil.
- **volcengine.go** - the `modelConfig` pointer itself was dereferenced
(`Stream`, `MaxTokens`, `Temperature`, .) with no guard, and `Effort`
was dereferenced unchecked. `modelConfig` now defaults to an empty
`&ChatConfig{}` when nil so the optional-field accesses are safe, and
`Effort` defaults to `"medium"` when nil.
Addresses the CodeRabbit review on `volcengine.go`
`ChatStreamlyWithSender`. Per maintainer feedback ("one PR do one
thing"), the unrelated `handler/auth.go` and
`service/heartbeat_sender.go` changes were removed so this PR is scoped
to the model-provider fixes.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)