…errors

…dling and docs

… gemini-3-flash

…ine LLM model names.

…ations.

…call compatibility

- Add ModelConfig struct with protocol prefix support (openai/, anthropic/, etc.)
- Implement GetModelConfig with round-robin load balancing
- Add CreateProviderFromConfig factory for protocol-based routing
- Add ModelRegistry for thread-safe endpoint selection
- Maintain full backward compatibility with legacy providers config
- Update README.md and README.zh.md with model_list documentation
- Add migration guide at docs/migration/model-list-migration.md

Supported protocols: openai, anthropic, antigravity, claude-cli, codex-cli,
github-copilot, openrouter, groq, deepseek, cerebras, qwen, zhipu, gemini

Closes sipeed#283

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Refactor command handlers into separate files to improve code organization
and maintainability. Each command (agent, auth, cron, gateway, migrate,
onboard, skills, status) now has its own dedicated file.

Restructure provider creation to support new model_list configuration
system that enables zero-code addition of OpenAI-compatible providers.
Move legacy provider logic to separate file for backward compatibility.

Move configuration functions from config.go to separate files
(defaults.go, migration.go) for better organization.

- Move OAuth helper functions to factory_provider.go
- Add auto-migration in LoadConfig: old providers -> model_list
- Add Workspace field to ModelConfig for CLI-based providers
- Fix OAuth handling to use auth store instead of raw APIKey
- Update tests to use new model_list configuration format

This eliminates the giant switch-case in legacy_provider.go,
achieving the goal of "zero-code provider addition" from the
design document (issue sipeed#283).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1. Add VLLM default API base (http://localhost:8000/v1)
   - Previously returned empty string, causing provider creation to fail

2. Implement MaxTokensField configuration
   - Add maxTokensField field to HTTPProvider
   - Add NewHTTPProviderWithMaxTokensField constructor
   - Use configured field name for max_tokens parameter
   - Fallback to model-based detection for backward compatibility

3. Add tests for VLLM, deepseek, ollama default API bases

Example config usage:
{
  "model_name": "glm-4",
  "model": "openai/glm-4",
  "max_tokens_field": "max_completion_tokens"
}

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Preserve user's configured model during config migration (issue sipeed#5)
- Simplify ExtractProtocol using strings.Cut
- Extract NormalizeToolCall to shared utility, removing ~70 lines of duplicate code
- Clean up unused fields in providerMigrationConfig struct

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Add validation to ensure model_name is unique across all entries in
model_list. This prevents potential conflicts when multiple model
configs share the same model_name identifier.

When no provider field is set but model is specified, use the user's model
as ModelName for the first provider. This maintains backward compatibility
with old configs that relied on implicit provider selection and ensures
GetModelConfig(model) can find the model by its configured name.

Append emergency compression note to the original system prompt
instead of creating a separate system message. Some APIs like
Zhipu reject two consecutive system messages.

…r-by-protocol

…d configuration

- Move provider creation logic to factory_provider.go with protocol-based approach
- Add OpenAIProviderConfig with WebSearch support and embedded ProviderConfig
- Add maxTokensField to OpenAI-compatible provider for configurable token field
- Introduce new providers: Ollama, DeepSeek, GitHubCopilot, Antigravity, Qwen
- Remove redundant CreateProvider function from factory.go
- Add ThoughtSignature field to FunctionCall for tool response handling
- Remove duplicate Name field assignment in tool loop
- Update tests to reflect new provider configuration structure

Resolved conflicts:
- pkg/config/config.go: Removed duplicate DefaultConfig() (already in defaults.go)

Upstream changes:
- Added Session.DMScope default value ("main")
- Various channel improvements

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>